Which one of the following is a non-reducing carbohydrate?

Maltose

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Sucrose

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Lactose

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Ribose 5-phosphate

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Solution

The correct option is B Sucrose
A reducing sugar is any sugar that is capable of acting as a reducing agent because it has a free aldehyde group or a free ketone group. All monosaccharides are reducing sugars, along with some disaccharides, oligosaccharides, and polysaccharides.
Of the given option, sucrose is the only non-reducing sugar. It is disaccharide composed of glucose and fructose.

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