Ncert Exercises & Solutions

In disaccharides, if the reducing groups of monosaccharides, i.e., aldehydic or ketonic groups are bonded, these are non-reducing sugars. Which of the following disaccharide is a non-reducing sugar?

1.
2.
3.
4.

HINT: Reducing sugars are sugars where the anomeric carbon has an OH group attached that can reduce other compounds. Non-reducing sugars do not have an OH group attached to the anomeric carbon so they cannot reduce other compounds.

This structure represents sucrose in which $α$ $α$ -D glucose and $β$ $β$ -D-fructose is attached to each other by $C_{1} - C_{2}$ $C_{1} - C_{2}$ glycosidic linkage.

Since reducing groups of glucose and fructose are involved in glycosidic bond formation, this is considered as a non-reducing sugar.

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