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 $\mathrm{C}_1$ 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
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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
