Biomolecules And Chemistry In Everyday Life Result Question 6 — JEE PYQ Chapterwise
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 $\mathrm{C}_1$ of $\alpha$-glucose and $\mathrm{C}_1$ 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 $\mathrm{C}-1$ 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.
$ \mathrm{C}{12} \mathrm{H}{22} \mathrm{O}_{11}+\mathrm{H}_2 \mathrm{O} \xrightarrow{\mathrm{HCl}} \underset{\text { D.(+)-glucose }}{\mathrm{C}6 \mathrm{H}{12} \mathrm{O}_6}+\underset{\text { D-(-)-fructose }}{\mathrm{C}6 \mathrm{H}{12} \mathrm{O}_6} $
BETA
