JEE Main Chemistry question

A cyclopropane-fused carboxylic acid --CH₂N₂--> ? Product is

(A)A ring-expanded cyclobutane carboxylic acid (via carbene insertion/ring expansion)
(B)The simple methyl ester, with the ring unchangedCorrect
(C)A triangular methyl ester with the ring contracted further
(D)An uncyclized open-chain product

Answer: (B)

Solution

Diazomethane reacts with carboxylic acids under simple, mild conditions to methylate the acidic O–H directly (proton transfer to CH₂N₂ followed by loss of N₂ and SN2-type methylation by the

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Question ID VK-149463