Which one given below is a reducing sugar?

Glucose

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Sucrose

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Maltose

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Lactose

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Solution

The correct option is D Lactose
All monosaccharides whether aldoses or ketoses are reducing sugars. Disaccharides such as sucrose in which the two monosaccharide units are linked through their reducing centres i.e., aldehydic or ketonic groups are non-reducing.

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