Which of the following classes of compounds do glucose and fructose represent ?

Aldoses and ketoses, respectively

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Polyols

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Monosaccharides

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Aldoses

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Solution

The correct options are
A Aldoses and ketoses, respectively
B Polyols
D Monosaccharides
Glucose and fructose both are monosaccharides, which are polyhydroxy (or polyols) aldehydes or polyhydroxy ketones.
Glucose is an aldose sugar because it has one aldehydic group in its structure whereas fructose is ketose sugar, since it contains one keto group.

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