Exaplain sucrose is a non reducing sugar (figure not essential). - Vidyadip

Question

Exaplain sucrose is a non reducing sugar (figure not essential).

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Answer

⇒ One of the common disaccharides is sucrose which on hydrolysis gives equimolar mixture of D-(+)glucose and D- (-)fructose.

⇒ These two monosaccharides are held together by a glycosidic linkage between C₁ of $\alpha$-D Glucose and C₂ of ẞ-D fructose.

⇒ Sucrose is dextrorotatory but after hydrolysis gives dextrorotatory glucose and laevorotatory fructose.
⇒ Since the laevorotation of fructose (-92.4°) is more than dextrorotation of glucose (+52.5°) the mixture is laevorotatory.
⇒ Thus, hydrolysis of sucrose brings about a change in the sign of rotation, from dextro (+) to laevo (-) and the product is named as invert sugar.

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