MHT CET 2025 Chemistry question

Which from following tests confirms presence of aldehydic group in glucose?

(A)Formation of oxime when reacted with
(B)Formation of gluconic acid when reacted with waterCorrect
(C)Formation of saccharic acid when glucose and gluconic acid treated with dil
(D)Formation of penta acetate when treated with acetic anhydride

Answer: (B)

Solution

Bromine water is a mild oxidising agent that oxidises only the aldehydic (-CHO) group to -COOH, converting glucose into gluconic acid () while leaving the -CHOH group untouched. This is a test specific to the aldehyde group (a ketone is not oxidised by it), so (B)

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Question ID VK-101325