JEE Main Chemistry question

R–CO–Z + Nu⁻ → R–CO–Nu + Z⁻ is fastest when Z is

(A)ClCorrect
(B)NH₂
(C)OC₂H₅
(D)OCOCH₃

Answer: (A)

Solution

The rate of nucleophilic acyl substitution correlates with how good a leaving group Z⁻ is (and inversely with how much Z donates electron density into the carbonyl by resonance, which would

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Question ID VK-149306