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JEE Main Chemistry question

ChemistryOrganic Chemistry - Some Basic Principles and TechniquesJEE Main

Match each named reaction/process in Column-I with the mechanistic feature in Column-II that best characterizes it, and select the correct code:

| Column-I | Column-II | |---|---| | (A) Claisen condensation | (p) Free radical | | (B) Allylic bromination | (q) Carbon anion | | (C) Fries rearrangement | (r) Alkyl migration | | (D) Wolff rearrangement | (s) Acyl migration |

Answer: (A)

Solution

(A) Claisen condensation proceeds via the ester enolate, a stabilized carbanion, attacking a second ester's carbonyl carbon → A–q (Carbon anion). (B) Allylic bromination (e.g. with NBS) proceeds via a resonance-stabilized allylic free radical → B–p (Free radical). (C) Fries rearrangement of an aryl ester to a hydroxy

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Question ID VK-149474