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Q. 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?

Biomolecules

Solution:

In option , two monosaccharides are held together by a glycosidic linkage between $C-1$ of $\alpha$-glucose and $C-2$ of $\beta$-fructose.