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Question

A non-reducing sugar ”A” hydrolysis to give two reducing monosaccharides. Sugar A is:

A
Glucose
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B
Fructose
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C
Sucrose
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D
Galactose
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Solution

The correct option is C Sucrose
Answer: (c)
Glucose, Fructose and Galactose are monosaccharides, they cannot undergo further hydrolysis.

Sucrose has neither aldehyde of glucose nor ketone of fructose because of C1C2 glycosidic linkage. So, it is non-reducing in nature.

C12H22O11+H2OC6H12O6+C6H12O6

On hydrolysis of sucrose, it gives D-glucose and D-fructose which have acetal group so they are reducing monosaccharides.

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