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Monosaccharides

All the follo...

Question

All the following are ketones except

A

Xylulose

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B

Ribulose

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C

Erythrose

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D

Fructose

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Solution

The correct option is A Erythrose
Carbohydrates are polyhydroxy aldehydes and ketones. They have two functional groups alcohol and either aldehyde or ketone. Those carbohydrates which have an aldehyde group are called aldoses whereas those which have a ketone group are called ketoses. Erythrose is a tetrose sugar (having four carbon atoms) which forms the raw materials for the synthesis of anthocyanin and lignin. It is an aldose sugar.
So, the correct answer is option C.

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