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**Answer**(d)

An antiseptic is an antimicrobial drug. It tends to destroy/prevent development or inhibit the pathogenic action of microbes. Antiseptics are applied to the living tissues such as wounds, cuts, ulcers and diseased skin surfaces e.g., soframicine.

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Bithionol the compound is also called bithional is added to soaps to impart antiseptic properties.

Dilute solutions of some disinfectants can be used as antiseptic e.g., 0.2 per cent solution of phenol is an antiseptic while its one per cent solution is disinfectant. But, antiseptic medicines can not be ingested like antibiotics.

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**Answer**(c)

Chemical substances which are used to check pregnancy in women are called birth control pills. Birth control pills essentially contain a mixture of synthetic estrogen and progesterone derivatives, both of these are sex hormones. It is known that progesterone suppresses ovulation and estrogen control the menstrual cycle.

Some of the commonly used pills contain a mixture of norethindrone (a progesterone derivative) and novestrol (an estrogen).

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Aspirin inhibits the synthesis of compounds known as prostaglandins which stimulate inflammation in the tissues and cause pain. So, it is effective in relieving pain.

Beside this, aspirin has many other effects such as reducing fever (antipyretic) and preventing blood platelet coagulation. Because of this anti-blood clotting action, it is widely used to prevent heart attacks. It does not make a person addictive as it is non-narcotic drug.

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**Answer**(c)

Drugs can be classified in the following ways

**(a) On the basis of chemical structure** Drugs have been classified on the basis of their chemical structures because drugs having common structural features often have similar pharmacological activity. e.g., all sulphonamides having the common structural feature as given below are mostly antibacterial.

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Structural feature of sulphonamide

**(b) On the basis of drug action** This classification is based on the action of a drug on a particular biochemical process.

**(c) On the basis of molecular target** Drugs usually interact with the biomolecules or biological macromolecules such as proteins, nucleic acids and lipids. These are called drug targets.

Drugs possessing some common structural features may have the same mechanism of action on a specific drug target. This classification is most useful for the medicinal chemists.

**(d) On the basis of pharmacological effect** This classification is based upon the pharmacological effects of the drugs. It is more useful for the doctors because it provides them the whole range of drugs available for the treatment of a particular disease. e.g., analgesics reduce or kill pain while antiseptic either kill or arrest the growth of microorganisms.

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**Ques.** Which of the following statements is correct?

(a) Some tranquilizers function by inhibiting the enzymes which catalyse the degradation of noradrenaline

(b) Tranquilizers are narcotic drugs

(d) Tranquilizers are chemical compounds that can relieve pain and fever

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**Answer**(a)

Tranquilizers are used for the treatment of stress, fatigue, mild and severe mental diseases. They relieve anxiety, stress, irritability or excitement by inducing a sense of well-being. Noradrenaline is one of the several neurotransmitters which play an important role in mood changes.

If the level of noradrenaline in the body is low for some reasons, then the message transfer process becomes slow and the person suffer from depression. In such cases, antidepressant drugs are used. These drugs inhibits the enzymes which catalyse the degradation of noradrenaline.

If the enzyme is inhibited, then the neurotransmitter noradrenaline is slowly metabolised and can thus activate the receptor for longer periods there by counteracting the effect of depression. Tranquilizers form an essential component of sleeping pills.

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Paul Ehrlich investigated arsenic based structures in order to produce less toxic substances for the treatment of syphilis as he got Nobel prize for medicine in 1908 for this discovery. Salvarsan was the first effective medicine discovered for syphilis. Although salvarsan is toxic to human beings, its effect on bacteria is much greater than on human being. Structure of salvarsan is -

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**Answer**(a)

Antibiotics are now defined as chemical substances which in low concentration, either kill or inhibit the growth of microorganisms by intervening in their metabolic processes. The full range of microorganisms attacked by an antibiotic is called its spectrum.

Broad spectrum antibiotics are effective against several different types of harmful bacteria i.e., a wide range of gram-positive and gram-negative bacteria. These effective mainly against gram-positive or gram-negative bacteria are narrow spectrum antibiotics.

Chloramphenicol is a broad spectrum antibiotic penicillin-G has a narrow spectrum. If an antibiotic is effective against a single organism or disease then it is limited spectrum antibiotic.

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**Answer**(b)

Analgesics reduces or abolish pain without causing impairment of consciousness, mental confusion, incordination or paralysis or some other disturbances of nervous system. Analgesics are non-narcotic or narcotic. Narcotic analgesics when administered in small doses relieve pain and produce sleep.

Tranquilisers are a class of chemical compounds used for the treatment of stress, and mild or even severe mental diseases.

Histamine is a substance which on release produce hypersensitivity to dust, some drugs etc (i.e., allergy). Antihistamines are the drugs which interfere with the natural action of histamine by competing with histamine for binding sites of receptor where histamine exerts its effect. They are anti-allergy drugs.

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**Answer**(c)

Glycerol is added to shaving soap to prevent rapid drying while to enhance the leathering property of soap, a gum called rosin is added to them. It forms sodium rosinate which lathers well. Soap granules are dried miniature soap bubbles.

Builders/fillers make the soap act more rapidly. Builder or filler (e.g. sodium tripolyphosphate) is added to detergent powder. Its main function is to act as water softener by removing $Mg^{2+}$ and $Ca^{2+}$ ions from hard water by forming stable soluble complexes.

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Other two classes of detergents are anionic detergents and cationic detergents. Anionic detergents are sodium salts of sulphonated long chain alcohols or hydrocarbons.

Anionic detergent (sodium lauryl sulphate)

They are mostly used for household work.

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**Answer**(c)

Drugs can block the binding site of the enzyme and present the binding of substrate, or can inhibit the catalytic activity of the enzyme. Such drugs are called enzyme inhibitors. Drugs inhibit the attachment of substrate on active site of enzyme in two different ways.

(i) Drugs which compete with natural substrate for their attachment on the active sites of enzymes are called competitive inhibitors.

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**Competitive inhibitors (Drug and substrate competing for active site)**

(ii) However, some drugs do not bind to the active site but bind to a different site of enzyme i.e., allosteric site which changes the shape of the active site of the enzyme in such a way that the natural substrate cannot recognize it. Such enzymes are called non-competitive inhibitors.

Generally, a weak bond such as hydrogen bonding, van der, Waals' interactions etc., is formed between the enzyme and inhibitor.

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**Non-competitive inhibitor changes the active site of enzyme after binding at allosteric site**

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**Answer**(d)

Sucrose and glucose are natural sweetening agent while aspartame and sucralose are artificial sweetening agent.

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Aspartame is roughly 100 times as sweet as cane sugar. It is methyl ester of dipeptide formed from aspartic acid and phenylalanine. Use of aspartame is limited to cold foods and soft drinks because it is unstable at cooking temperature.

Sucralose is trichloro derivative of sucrose. Its appearance and taste are like sugar. It is stable at cooking temperature. It does not provide calories.

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**Answer**(b)

Vitamins and minerals are essential nutrients because they perform hundred of roles in the body. They help shore up bones, heal wounds, and bolster immune system. They also convert food into energy, and repair cellular damage.

Artificial sweeteners are non-caloric substitutes for sugar. They are often intensly more sweet than sugar but do not enhance nutritional value of food.

Amino acids are the monomers of proteins. Proteins require for the growth and maintenance of the body. Therefore, amino acids will also enhance the nutritional value of food.

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**Ques.** Which of the following statements are incorrect about receptor proteins?

(a) Majority of receptor proteins are embedded in the cell membranes

(b) The active site of receptor proteins opens on the inside region of the cell

(d) Shape of receptor doesn't change during attachment of messenger

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**Answer**$(b, d)$

Receptors are proteins that are crucial to body's communication process. Majority of these are embedded in cell membranes. They are embedded in the cell membrane in such a way that their small part possessing active site projects out of the surface of the membrane and opens on the outside region of the cell membrane.

In the body, message between two neurons and that between neuron to muscles is communicated through certain chemicals. These chemicals, known as chemical messengers are received at the binding site of receptors proteins.

To accommodate a messenger, shape of the receptor site changes. This brings about the transfer of message into the cell. Thus, chemical messenger gives message to the cell without entering the cell.

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**Answer**$(a, b)$

Sulpha drugs kills bacteria and fungi by interfering with their metabolism.
 
(a) Sulphapyridine is a sulphonamide antibacterial drug. It is no longer prescribed for the treatment of infections in humans. It is a good antibacterial drug, but its water solubility is very $pH$ dependent. Thus, there is a risk of crystallisation within the bladder or urethra, which could lead to pain or blockage.

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**Answer**$(a, b, c)$

Antidepressants are the substances which correct chemical imbalances of neurotransmitters in the brain and probably cause changes in mood and behaviour.

Iproniazid is a hydrazine drug used as an antidepressant. Phenelzine is also known as Nardil. It is used in the treatment of major depressive disorder. Equanil is used in controlling depression and hypertension.

Salvarsan is an antibacterial drug. It is used in the treatment of Syphilis.

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**Answer** $(c, $d)$

Penicillin is a group of antibiotics derived from Penicillium fungi. Ampicillin and Amoxycillin are synthetic modifications of penicillin. Pencillin destroys bacteria by destroying the cell wall of the microorganism or kill the bacteria so, it has bacteriocidal effect.

Penicillin as a class of antibiotics are generally narrow spectrum but when used in the combination with other antibiotics, it can make up a part of broad spectrum antibiotics.

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**Answer**$(b, d)$

Antacid is a substance which neutralizes excess of acid in stomach.

The chemical formula of sodium hydrogen carbonate is $NaHCO_3$. It is often used as an antacid because it neutralises excess of $HCl$ secreted from the walls of stomach

$
NaHCO _3(s)+HCl(aq) \to NaCl(aq)+H _2 O(l)+CO _2
$

However, excessive hydrogen carbonate can make the stomach alkaline and trigger the production of even more acid.

Milk of magnesia, which is an aqueous solution of magnesium hydroxide is also used as an antacid.

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**Answer**$(a, d)$

Histamine is a substance that stimulates the secretion of pepsin and hydrochloric acid. There are some antacids like cimetidine were designed to prevent the interaction of histamine with the receptors present in the stomach wall. As a result less $HCl$ is released and the cause of hyperacidity is controlled/cured.

Ranitidine is also fall in the category of antihistamine. It is used to cure hyperacidity.

Brompheniramine is an antihistamine. It is used to treat runny nose, sneezing, itching and watery eyes caused by allergy.

Terfenadine, an antihistamine, was used for allergy.

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**Answer**$(a, d)$

Derivatives of barbituric acid viz., veronal and luminal are called barbiturates. These barbiturates constitute an important class of tranquilizers.

Tranquilizers are a class of chemical compounds used for the treatment of stress and mild or severe mental diseases. Tranquilizers are neurologically active drugs. These drugs affect the message transfer mechanism from nerve to receptor.

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**Answer**$(a, c, d)$
 
(a) Cationic detergents are quarternary ammonium salts of amines with acetates, chlorides or bromides as anions. These detergents have germicidal properties. Hence, option (a) is correct.

(b) Bacteria can not degrade the detergents containing highly branched chains, therefore, in most of the detergents used these days, the branching is kept to a minimum so that the detergents become easily biodegradable. Hence, option (b) is incorrect.

(d) Synthetic detergents are cleansing agents which have all the properties of soaps, but which actually do not contain any soap. Hence, option (d) is correct.

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**Answer**

Disease in human beings and animals may be caused by a variety of microorganisms such as bacteria, virus, fungi and other pathogens.

An antimicrobial tends to destroy/prevent development or inhibit the pathogenic action of microbes such as bacteria (antibacterial drugs), fungi (antifungal agents), virus (antiviral agents), or other parasites (antiparasitic drugs) selectively. Antiseptic, disinfectants, antibiotics and sulpha drugs are antimicrobial drugs.

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**Answer**

During the catalytic action of an enzyme, enzyme hold the substrate for a chemical reaction. Active sites of enzymes holds the substrate molecule in a suitable position, so that it can be attacked by the reagent effectively.

Substrate bind to the active site of the enzyme through a variety of interactions. These forces are van der Waals' interactions, ionic bonding, hydrogen bonding or dipole-dipole interaction.

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**Answer**

Arsphenamine is also known as salvarsan. It is a synthetic organic arsenic compound that was previously used for treating syphilis. Arsphenamine possess - As = As - linkage.

Azo dyes are used to promote epithelial growth in the treatment of ulcers, burns, and other wounds. Many azodyes have anticoagulation action. Azo dyes possess $-N=N-$ linkage like arsphenamine which possess - As $=As$ - linkage .

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**Answer**

Aspirin is 2- acetoxybenzoic acid. It is very effective in reducing or abolishing pain without causing impairment of consciousness, mental confusion, incordination or paralysis or some other disturbance or disorder of the nervous system. It reduces fever (antipyretics) and prevents platelet coagulation.

Due to, it has anti blood clotting action and, therefore, it is widely used to prevent heart attack.

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**Answer**

Histamine is a chemical substance that stimulates the secretion of pepsin and hydrochloric acid in stomach. Antacids are designed to prevent the interaction of histamine with the receptors present in the stomach wall. As a result, less $HCl$ is released in stomach.

Histamine contracts the smooth muscles in the bronchi and gut and relaxes other muscles in walls of fine blood vessels. As a result, histamine causes allergy. Antihistamines interfere with the natural action of histamine by competing with histamine for binding sites of receptor where histamine exerts its effect.

Since, antiallergic and antacids drugs work on different receptors, therefore, antihistamines remove allergy while antacids remove acidity.

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**Answer**

Chemical substances which concentrates at the surface of the solution or interfaces, from surface films, reduces surface tension of the solution and help in removing dirt and dust by emulsifying grease are called surfactants i.e., soap and detergents.

Soaps are sodium or potassium salts of long chain fatty acids such as palmitic acid $(C    _{15} H   _{31} COOH)$, stearic acid $(C   _{17} H _3 COOH)$ and linolic acid $(C   _{17} H   _{31} COOH)$

Potassium salts of fatty acids such as palmitic acid, stearic acid and oleic acid are called soft soap.

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**Answer**

A solution of soap is titrated with standard hydrochloric acid. It is an acid-base titration. In this titration, phenolphthalein is used as an indicator. During the preparation of soap, fat (i.e., glyceryl ester of fatty acid) is heated with aqueous sodium hydroxide

Thus, the source of this excess alkali (which irritates skin) is the alkali left unused when the soap is prepared by hydrolysis of fat.

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**Answer**

Detergents have long hydrocarbon chains. If their hydrocarbon chain is highly branched, then bacteria cannot degrade this easily. Such detergents are non-biodegradable. Slow degradation of detergents leads to their accumulation.

These non-biodegradable detergents persist in water even after sewage treatment and cause foaming in rivers, ponds and their water get polluted. In order to overcome this issue branching of the hydrocarbon chain is controlled and kept to minimum.

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**Answer**

Anionic detergents such as sodium lauryl sulphate, sodium dodecylbenzenesulphonate etc are used in toothpaste. They are responsible to clean the teeth and to provide a foam that helps to carry away the debris.

Further, sodium lauryl sulphates have significant antibacterial properties, and can penetrate as well as dissolve the plaque.

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**Answer**

Dishwashing soaps are non-ionic detergents. It can be prepared by the reaction of stearic acid with polyethylene glycol.

$
\begin{aligned}
& \underset{\text{ Stearic acid }}{CH _3-(CH)    _{16} COOH}+HO-(CH _2 CH _2 O)  _{n}-\underset{\text{ Polyethylene glycol }}{CH _2 CH _2 OH} \xrightarrow{-H _2 O} \\\\\\
& CH _3-(CH _2)    _{16} COO(CH _2 CH _2 O)  _{n} CH _2 CH _2 OH
\end{aligned}
$

Since, non-ionic detergents do not contain any ion in their constitution, it is neutral in nature.

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**Answer**

Sodium lauryl sulphate, $CH _3(CH _2)    _{10} CH _2 OSO _3^{-} \stackrel{+}{N}$ a is an example of anionic detergent.

When added to water, it dissociates as follows

$
CH _3-(CH _2)    _{10}-CH _2 OSO^{-}{ } _3 \stackrel{+}{Na} \stackrel{+H _2 O}{\longrightarrow} CH _3-(CH _2)   _{10} CH _2-OSO^{-}{ } _3+\stackrel{+}{Na}
$

These anions are present on the surface with their $-OSO_3^{-}$groups in water and hydrocarbon part staying away from it and remain at the surface.

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At higher concentration, these anions are pulled into the bulk of the solution and form an aggregate of spherical shape with their hydrocarbon part pointing towards the centre and $OSO_3^{-}$part outwards on the surface of the sphere.

An aggregate thus formed is known as micelle.

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**Answer**

Detergents having highly branched hydrocarbon chains cause pollution in rivers. The reason being that side chains stop bacteria from attacking and breaking the chains.

Thus, lesser the branching more is the biodegradability i.e., detergents with long straight hydrocarbon chains are more easily degraded than those having branched hydrorcarbon chains.

Since, unbranched (i.e., straight) chains are more prone to attack by bacteria, therefore, in most of the detergents used these days, the branching is kept to be minimum, so that the detergents become easily biodegradable.

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**Answer**

Antiseptics and disinfectants both are antimicrobials. Antiseptics prevent or destroy development or inhibit the pathogenic action of microbes. They are safe to be applied on living tissues.

On the other hand, disinfectants also kill microorganisms but are not safe to be applied on living tissues. They are generally applied on non-living objects such as drains, toilets, floors and living rooms infected with bacteria and disease carrying germs.

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**Answer**

Analgesics reduce or abolish pain without causing impairment of consciousness, mental confusion, incoordination or paralysis or some other disturbances of nervous system. These are classifieds in two categories

(i) **Non-narcotic** (non-addicitive) **analgesics** - Aspirin and paracetamol belong to the class of non-narcotic analgesics.

(ii) **Narcotic analgesics**-Morphine and many of its homologues, when administered in medicinal doses, relieve pain and produce sleep. In poisonous doses, these produce stupor, coma, convulsions and ultimately death. Morphine narcotics are sometimes referred to as opiates, since they are obtained from the opium poppy.

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**Answer**

Drugs that bind to the receptor site and inhibit its natural function are called antagonist, drugs e.g., cimetidine is an antagonist drug because it binds to the receptor site in stomach otherwise histamine will bind to the receptor site and induce the secretion of $HCl$ in stomach.

Thus, this antacid blocks the receptor site and hence, the secretion of $HCl$ is reduced thereby reducing/removing hyperacidity.

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**Answer**

Soaps are sodium or potassium salts of long chain fatty acids such as stearic acid, oleic acid and palmitic acid. Soaps containing sodium salts are formed by heating fat (i.e., glyceryl ester of fatty acid) with aqueous sodium hydroxide  
 
<img src="https://cdn.mathpix.com/cropped/2024_01_24_76a1a59bab5d20ee6cc6g-391.jpg?height=347&width=830&top_left_y=549&top_left_x=400" height="200px">

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**Answer**

Usual antacid like sodium hydrogen carbonate control only the symptom and not the cause. They neutralize the excess of acid produce in the stomach. but do not control the cause of production of excess of $HCl$ in stomach.

Histamine, a chemical, is responsible for the secretion of pepsin and $HCl$ in the stomach. Antihistamine are the drugs which supress the action of histamine, which in turn supress the secretion of pepsin and $HCl$ in the stomach. Antihistamine prevent the binding of histamine with the receptors present in the stomach wall.

As a result, less $HCl$ is produced and hyperacidity is cured. Thus, a better treatment for curing acidity is to use antihistamines over antacids.

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**Answer**

Noradrenaline is a neurotransmitter which plays a crucial role in mood changes. If somehow any person has low level of noradrenaline in the body, then the signal sending activity becomes slow and the person suffers from depression.

For removing depression and to boost the mood, tranquilizers are used. These drugs inhibit the engyme which catalyse the degradation of noradrenaline.

From this result, neurotransmitter noradrenaline is slowly metabolised and can thus activate the receptor for longer periods.

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**Answer**

Substances which are added to soaps to change their properties in order to make them more useful for a particular application, are called fillers. Some important examples are given below

(i) Sodium rosinate, sodium silicate, borax and sodium carbonate are added to laundary soaps to increase their lather forming ability.

(ii) Glycerol is added to shaving soaps to prevent them from rapid drying.

(iii) In medicated soaps, substances of medicinal values are added.

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**Answer**

Natural sweetners e.g., sucrose add to calorie intake. Due to occurrence of more cases of diabetes and obesity among young and old people, these days people usually take low calorie drinks. These are artificial sweetening agents as given below

Saccharin It is 550 times as sweet as cane sugar. It is excreted from the body through urine.

Aspartame It is 100 times as sweet as cane sugar. Its use is limited to cold foods and soft drinks because it is unstable at cooking temperature.

Alitame It is more stable than aspartame but the control of sweetners of food is difficult while using it.

Sucralose It is stable at cooking temperature. It does not provide calories.

These artificial sweetening agents do not metabolize and hence do not produce any energy.

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**Answer**

Saccharin is an artificial sweetening agent. It is about 550 times as sweet as cane sugar. It is excreted from the body in urine unchanged. It appears to be entirely inert and harmless when taken. Its use is of great value to diabetic people who need to control intake of calories.

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**Answer**

Sucralose is trichloro derivative of the sucrose. Its appearance and taste are like sugar. It is stable at cooking temperature. Sucralose contributes zero calories to the diet, compared with sucrose, which contributes 16 calories per teaspoon. Structure of sucralose is

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**Answer**

Aspartame is the most successful and widely used artificial sweetener. It is methyl ester of dipeptide formed from aspartic acid and phenylalanine. Its use is limited to cold foods and soft drinks because it is unstable at cooking temperature.

Structure of aspartame is

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**Answer**

A preservative is naturally occuring or synthetically produced substance that is added to foods to prevent decomposition by microbial growth or by undesirable chemical changes. Sodium salts of same acids are very useful as food preservatives. Some examples of such acids are as follows

(i) Benzoic acid in the form of its sodium salt, constitutes one of the most common food preservative. Sodium benzoate is a common preservative in acid or acidified foods such as fruit, juices, pickles etc. Yeasts are inhibited by benzoate to a greater extent than are moulds and bacteria.

(ii) Sorbic acid and its salts (sodium, potassium and calcium) also have preservative activities but the applications of sodium sorbate $C _6 H _7 NaO _2$ are limited compared to that for potassium salt.

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**Answer**

Some drugs do not bind to the active site of enzymes to inhibit their activities. These bind to a different site of enzyme. This binding of inhibitor (drug) changes the shape of the active site in such a way that substrate cannot recognise it.

The site different from active site of an enzyme where a drug molecule can bind is called the allosteric site.

Non-competitive inhibitor changes the active site of enzyme after binding at allosteric site.

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**Answer**

Receptor proteins are embedded in the cell membrane in such a way that their small part possessing active site projects out of the surface of the it membrane and opens on the outside region of the cell membrane.

Receptor protein embedded in the cell membrane, the active site of the receptor opens on the outside region of the cell

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**Ques.** Match the soaps given in Column I with items given in column II.

|  | Column I |  | Column II |
| :---: | :---: | :---: | :---: |
| A. | Soap chips | 1. | dried miniature soap bubbles |
| B. | Soap granules | 2. | small broken pieces of soap formed from melted <br> soaps |
| C. | Soap powder | 3. | soap powder + abrasives + builders <br> $(Na _2 CO _3, Na _3 PO _4)$ |
| D. | Scouring soap | 4. | soap powder + builders like $Na _2 CO _3$ and $Na _3 PO _4$ |

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<footer> <font size = "4"> MCQ (Single correct option)  $\rarr$ MCQ (More than one correct questions)$\rarr$  Short answer type questions $\rarr$ <span style="color:blue">Matching the columns</span> $\rarr$ Assertion and Reason $\rarr$ Long answer type questions  </font></footer>

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A. Soap chips are made by running a thin sheet of melted soap into a cool cylinder and scraping off the soaps in small broken pieces.

B. Soap granules are dried miniature soap bubbles.

C. Soap powders contain soap powder and builders like sodium carbonate and trisodium phosphate. Builders make the soap act more rapidly.

D. Scouring soaps contain soap powder, a scouring agent (abrasive) such as powdered pumice or finely divided sand and builders.

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**Ques.** Match structures given in Column I with the type of detergents given in Column II.

| Column I |  |  | Column II |  |
| :---: | :---: | :---: | :---: | :---: |
| A. | $CH _3(CH _2)    _{16} COO(CH _2 CH _2 O)  _{n}$ | $CH _2 CH _2 OH$ | 1. | Cationic detergent |
| B. | $C    _{17} H   _{35} COO^{-} Na^{+}$ |  | 2. | Anionic detergent |
| C. | $CH _3-(CH _2)    _{10} CH _2 SO _3^{-} Na^{+}$ |  | 3. | Nonionic detergent |
| D. | <img src="https://cdn.mathpix.com/cropped/2024_01_24_76a1a59bab5d20ee6cc6g-396.jpg?height=189&width=352&top_left_y=1953&top_left_x=392" height="100px"> | $Br^{-}$ | 4. | Soap

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**Ques.** Match the class of compounds given in Column I with their functions given in Column II.

| | Column I |  | Column II |  
| :--- | :--- | :--- | :--- |
| A. | Antagonists | 1. | Communicate message between two <br> neurons and that between neurons to <br> muscles. |
| B. | Agonists | 2. | Bind to the receptor site and inhibit its <br> natural function. |
| C. | Chemical messenger | 3. | Crucial to body's communication process. |
| D. | Inhibitors | 4. | Mimic the natural messenger. |
| E. | Receptors | 5. | Inhibit activities of enzymes. |

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A. **Antagonist** drugs are used when blocking of message is required. e.g., dopamine antagonist is a drug which blocks the dopamine receptors by receptor antagonism.

B. **Agonist** drugs are useful when there is lack of chemical messenger. e.g., heroin.

C. These **chemical messengers** are received at the binding sites of receptor. These communicate message between two neurons and that between neurons to muscles.

D. **Inhibitors** block the binding site of the enzyme and prevent the binding of the substrate, or inhibit the catalytic activity of the enzyme.

E. **Receptors** are proteins that are crucial to body's communication. They are embedded in the cell membrane in such a way that their small part possessing active site projects out of the surface of the membrane and opens on the outside region of the cell membrane.

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**Ques.** Match the classes of drugs given in Column I with their action given in

| | Column I |  | Column II |  
| :--- | :--- | :--- | :--- |
| A. | Analgesics | 1. | Inhibit the growth of microorganisms can be <br> given orally |
| B. | Antiseptics | 2. | Treatment of stress |
| C. | Antihistamines | 3. | Applied to inanimate objects |
| D. | Antacids | 4. | Prevents the interaction of histamine with its <br> receptor |
| E. | Tranquilizers | 5. | Pain killing effect |
| F. | Antibiotics | 6. | Applied to diseased skin surfaces |
| G. | Disinfectants | 7. | Treatment of acidity |

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A. **Analgesics** reduce or abolish pain without causing impairment of consciousness, mental confusion, in coordination or paralysis or some other disturbances of nervous system, e.g., aspirin.

B. **Antiseptics** are the chemicals which either kill or prevent the growth of mircoorganisms. They are applied to living tissues such as wounds, cuts etc., e.g., tincture of iodine.

C. **Antihistamines** are anti-allergic drugs. These drugs interfere with the natural action of histamine by competing with histamine for binding sites of receptor where histamine exerts its effect. e.g., seldane.

D. **Antacids** are used to neutralise excess of acid released in stomach e.g., mixture of $Mg(OH) _2$ and $Al(OH) _3$.
 
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E. **Tranquilizers** are used for the treatment of stress, and mild or even severe mental diseases e.g., equanil.

F. **Antibiotics** are antimicrobial drugs. Antibiotics are used as drugs to treat infections because of their low toxicity for humans and animals e.g., chloramphenicol.

G. **Disinfectants** are the chemicals which either kill or prevent the growth of microorganisms but they can be applied on non-living objects e.g., 1 per cent solution of phenol.

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**Assertion and Reason**

In the following questions a statement of assertion (A) followed by a statement of reason $(R)$ is given. Choose the correct answer out of the following choices.

(a) Assertion and reason both are correct statements but reason does not explain assertion.

(b) Assertion and reason both are correct and reason explains the assertion.

(d) Assertion is correct statement reason is wrong statement.

(e) Assertion is wrong statement reason is correct statement.

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**Answer**

Prontosil, also called sulfamido chrysoidine, trade name of the first synthetic drug used in the treatment of general bacterial infections in humans.

Prontosil resulted from research, directed by German chemist and pathologist Gerhard Domagk, on the antibacterial action of azo dyes. A red azo dye of low toxicity, prontosil was shown by Domagk to prevent mortality in mice infected with Streptococcus bacteria.

The dye was also effective in controlling staphylococcus infections in rabbits. Within a relatively short period, it was demonstrated that prontosil was effective not only in combating experimental infections in animals but also against Streptococcal disease in humans, including meningitis and puerperal sepsis. Structural formula of prontosil is

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**Answer**

In the catalytic activity, enzymes perform the following two major functions

(i) The first function of an enzyme is to hold the substrate molecule for a chemical reaction. the active sites of the enzymes hold the substrate molecule in a suitable position, so that it can be attacked by the reagent effectively.

The substrate molecules bind to the amino acid residues of the protein present the active site of the enzyme through a variety of interactions such as hydrogen bonding, dipole-dipole interactions, van der Waals' interactions and ionic bonding.

These binding forces should be strong enough to hold the substrate long enough so that the enzyme can catalyse the reaction, but weak enough to allow the products to depart after their formation.

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Active site of enzyme
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Substrate

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(ii) The second function of the enzyme is to provide functional groups which will attack the substrate to carry out the chemical reaction. This function is carried out by some other amino acid residues of protein present on the active site of the enzyme.

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These provide free amino groups to attack the substrate and bring about the chemical reaction. If the amino acid serine is present nearby the substrate held on the active site, then its $-OH$ group is free to act as a nucleophile in the enzyme catalysed reaction.

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**Answer**

Synthetic detergents are cleansing agents which have all the properties of soaps, but which actually do not contain any soap. These can be used in soft as well as in hard water.

They are mainly classified into three categories

**(1) Anionic Detergents**

Anionic detergents are sodium salts of sulphonated long chain alcohols or hydrocarbons. Alkyl hydrogen sulphates formed by treating long chain alcohols with conc. $H _2 SO _4$ are neutralised with alkali to form anionic detergents. Similarly alkyl benzene sulphonates are obtained by neutralising alkyl benzene sulphonic acids with alkali.

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In these detergents, the anionic part of the molecule is involved in the cleansing action. They are mostly used for house hold work. They are also used in toothpaste.

**(2) Cationic Detergents**

They are quarternary ammonium salts of amines with acetates, chlorides or bromides as anions. Cationic part possess a long hydrocarbon chain and a positive charge on nitrogen atom. Cetyltrimethylammonium bromide is a popular cationic detergent and is used in hair conditioners.

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Cationic detergents have germicidal properties and are expensive, therefore, these are of limited use.

**(3) Non-ionic Detergents**

Non-ionic detergents do not contain any ion in their constitution. One such detergent is formed when stearic acid reacts with polyethylene glycol.

$
\begin{aligned}
& \underset{\text{ Stearic acid }}{H _3 C-(CH _2)    _{16} COOH}+HO(CH _2 CH _2 O)  _{n} CH _2 CH _2 OH \xrightarrow{\text{polyethyleneglycol }} \xrightarrow{-H _2 O} \\\\\\
& \quad \underset{\substack{\text{ Polyethyleneglycol stearate }}}{CH _3(CH _2)    _{16} COO(CH _2 CH _2 O)  _{n} CH _2 CH _2 OH}
\end{aligned}
$

Liquid dishwashing detergents are non-ionic type

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Advantages of Synthetic Detergents over Soaps

(i) Synthetic detergents can be used in hard water without any wastage while some of the soaps gets wasted.

(ii) Synthetic detergents can be used in acidic medium while soaps get precipitated.

(iii) Synthetic detergents are more soluble in water and hence produce lather more easily than soaps. Some synthetic detergents produce lather even in ice cold water.

(iv) Synthetic detergents decrease the surface tension of water to greater extent and hence have a stronger cleansing action than soap.

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Synthetic detergents have advantages over usual soaps but use of synthetic detergents over a long time creates environmental pollution because some detergents have highly branched hydrocarbon chains.

These branches or side chains stop bacteria from attacking and breaking the chains. This result in slow degradation of detergent molecule leading to their accumulation. Effluents containing these detergents reach the rivers, ponds etc. These persist in water even after sewage treatment and thus water gets polluted.

Since, unbranched (i.e., straight) chains are more prone to attack by bacteria, therefore, in most of the detergents used these days, the branching is kept to a minimum, so that the detergents become easily biodegradable and hence pollution is prevented.

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<Success style="float:center; font-size: 25px; text-align:center;"><b> **EVERYDAY LIFE**</b></Success>

#### <Primary style ="float:center; font-size: 23px; text-align:center;"> **Long answer type questions** </Primary>

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**Answer**

Enzymes are responsible to hold the substrate molecule for a chemical reaction and they provide functional groups which will attack the substrate to carry out the chemical reaction. Drugs which inhibit any of the two activities of enzymes are called enzyme inhibitors.

Enzyme inhibitors can block the binding site thereby preventing the binding of the substrate to the active site and hence inhibiting the catalytic activity of the enzyme.

Drugs inhibit the attachment of natural substrate on the active site of enzymes in two different ways as explained below

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<Success style="float:center; font-size: 25px; text-align:center;"><b> **EVERYDAY LIFE**</b></Success>

#### <Primary style ="float:center; font-size: 23px; text-align:center;"> **Long answer type questions** </Primary>

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(ii) Some drugs, however, do not bind to the active site but bind to a different site of the enzyme which is called allosteric site. This binding of the drug at allosteric site changes the shape of the active site of the enzyme in such a way that the natural substrate cannot recognise it. Such enzymes are called non-competitive inhibitors.

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