Question

Give two evidences for presence of

formyl group in glucose.

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Answer 1

Answer:

oxidation with Nitric acid (HNO3),glucose as well as gluconic acid both yeild a dicarboxylic acid (saccharic acid). This indicates the presence of a primary alcoholic group in glucose

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Answer 2

Explanation:

To prove the presence of −CHO group:

When glucose reacts with hydroxylamine, oxime is formed and cyanohydrins are formed on the addition of hydrogen cyanide to it. This reaction can confirm the presence of carbonyl group in glucose.