JEE Main Chemistry question

[IIT 2004] The correct order of reactivity of PhMgBr with (I) Ph–CO–Ph, (II) CH₃–CHO, (III) CH₃–CO–CH₃ is

(A)I > III > II
(B)III > I > II
(C)II > III > ICorrect
(D)II > I > III

Answer: (C)

Solution

Grignard addition to a carbonyl is fastest for the least hindered, most electrophilic carbonyl. The aldehyde (II) reacts fastest (one small H substituent, no resonance deactivation); the dialkyl ketone acetone

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Question ID VK-140294