Biomolecules and Chemistry in Everyday Life - Result Question 6
####6. Which of the following statement is not true about sucrose?
(2019 Main, 09 April I)
(a) It is also named as invert sugar.
(b) The glycosidic linkage is present between $C _1$ of $\alpha$-glucose and $C _1$ of $\beta$-fructose
(c) It is a non-reducing sugar
(d) On hydrolysis, it produces glucose and fructose
Show Answer
Answer:
Correct Answer: 6. (b)
Solution:
- Statement-(b) is not true for sucrose. It is linked through a glycosidic linkage between $C-1$ of $\alpha$-glucose and $C-2$ of $\beta$-fructose. Since, the reducing groups of glucose and fructose are involved in glycosidic bond formation, sucrose is a non-reducing sugar.
On hydrolysis with acids or enzyme, sucrose gives equimolar mixture of D-(+)-glucose and D-(-)-fructose.
$C _{12} H _{22} O _{11}+H _2 O \xrightarrow{HCl} \underset{\text { D-(+)-glucose }}{C _6 H _{12} O _6}+\underset{\text { D-(-)-fructose }}{C _6 H _{12} O _6}$
