First slide

Disaccharides

Question

Sucrose is a non reducing sugar because

Moderate

A

It has no free -OH group
B

It has a glycosidic linkage between C-1 of $α$ -D-glucopyranose and C-4 of $β$ -D-fructopyranose
C

It has no free anomeric -OH group
D

It is a disaccharide

Solution

It has a glycosidic linkage between C-1 of $α$ -D-glucopyranose and C-2 of $β$ -D-fructofuranose;
The -OH groups of functional group carbon atoms of both glucose(C-1) and fructose(C-2) are invoved in glycosidic linkage;
No free anomeric -OH group;
Both glucose and fructose are in acetal form;
It is a non reducing sugar;

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