JEE Main Chemistry question

Consider the following reagents: I. water II. Tollens' reagent III. Fehling's solution Which can be used to make a distinction between an aldose and a ketose?

(A)I, II and III
(B)II and III
(C)I onlyCorrect
(D)II only

Answer: (C)

Solution

Bromine water is a mild, specific oxidant that readily oxidises the free aldehyde of an aldose to a carboxylic acid but does not oxidise a ketose (which has no aldehyde group), so it decolourises with an aldose but not with a ketose, giving a clear distinguishing test. Tollens'

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Question ID VK-150779