Biomolecules and Chemistry in Everyday Life 1 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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Solution:
- Statement-(b) is not true for sucrose. It is linked through a glycosidic linkage between $\mathrm{C}-1$ of $\alpha$-glucose and $\mathrm{C}-2$ 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.
$\mathrm{C}{12} \mathrm{H}{22} \mathrm{O}{11}+\mathrm{H}{2} \mathrm{O} \xrightarrow{\mathrm{HCl}} \underset{\text { D-(+)-glucose }}{\mathrm{C}{6} \mathrm{H}{12} \mathrm{O}{6}}+\underset{\text { D-(-)-fructose }}{\mathrm{C}{6} \mathrm{H}{12} \mathrm{O}{6}}$
