SATHEE: Aromatic Aldehydes Ketones and Acids

Aromatic Aldehydes Ketones and Acids - Result Question 22

####26. The compound $Y$ is

(2018 Adv.)

(a)

(c)

(b)

(d)

Show Answer

Answer:

Correct Answer: 26. (a)

Solution:

Given,

(Major product) For this question we require only reaction 1 to 4 written above. Let us explore them one by one.

Reaction 1 It is called formylation or Gatterman Koch reaction. $A - C H O$ group is introduced to benzene ring through this reaction as

The attacking electrophile is $H - \overset{+}{C} = O$ which is generated as

(i) $C O + H C l ⇌ H - \underset{O}{C} - C l$

(ii) $H - \underset{O}{C} - C l + A l C l_{3} ⇌ H - \underset{O_{0}^{C}}{\overset{+}{O}} + A l C l_{4}^{-}$

Reaction 2 It is Perkin condensation which results in $α, β$ unsaturated acid as

Note Besides $C H_{3} C O O^{-} N a^{+}$ , quinoline, pyridine, $N a_{2} C O_{3}$ , triethylamine can also be used as bases in this reaction.

Reaction 3 It is simple addition of bromine to unsaturated acid formed through reaction 2 .

Cinnamic acid

$N a_{2} C O_{3}$ works as a base in the reaction to trap $H^{+}$ to be released

by $- C O O H$ of the reactant. in the reaction as the minor product.

Reaction 4 It is decarboxylation and dehydrohalogenation of product produced by reaction 3 as

Hence, $Y$ is

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अगला

Aromatic Aldehydes Ketones and Acids - Result Question 22

Answer:

Cinnamic acid

इंजीनियरिंग की तैयारी

चिकित्सा तैयारी

एनसीईआरटी पुस्तकें और समाधान

महत्वपूर्ण संसाधन

अन्य संसाधन

पाठ्यक्रम

परीक्षा मंच

नमूना मॉक टेस्ट

सदस्यता

एनसीईआरटी व्यायाम वीडियो समाधान

Aromatic Aldehydes Ketones and Acids - Result Question 22

Answer:

Cinnamic acid

इंजीनियरिंग की तैयारी

चिकित्सा तैयारी

एनसीईआरटी पुस्तकें और समाधान

महत्वपूर्ण संसाधन

अन्य संसाधन

पाठ्यक्रम

परीक्षा मंच

नमूना मॉक टेस्ट

सदस्यता

एनसीईआरटी व्यायाम वीडियो समाधान

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