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Question

Reducing sugar contains

A
> C = 0 group
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B
None of these
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C
−CHO group
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D
A and B
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Solution

The correct option is D A and B
A reducing sugar is 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, some oligosaccharides, and some polysaccharides.

The monosaccharides can be divided into two groups: the aldoses, which have an aldehyde group, and the ketoses, which have a ketone group. Ketoses must first tautomerize to aldoses before they can act as reducing sugars.

The common dietary monosaccharides galactose, glucose and fructose are all reducing sugars.

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