JEE Main Chemistry question

How can you say that glucose is cyclic?

(A)Glucose undergoes Tollens' reaction
(B)Glucose reacts with phenyl hydrazine
(C)Glucose fails to react with sodium hydrogen sulphiteCorrect
(D)Glucose reacts with nitric acid

Answer: (C)

Solution

A simple open-chain aldehyde is expected to form a bisulphite addition compound with saturated sodium hydrogen sulphite, but glucose fails to give this reaction (and also fails the 2,4-DNP and Schiff's tests), which shows that its aldehyde group is not freely available — it is masked in a cyclic hemiacetal form.

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Question ID VK-150633