Cl- -Br Mg/ ether [H_3O^+] HCHO A, A is

JEE Main Chemistry question

, is

(A)Br-cyclobutyl-
(B)Cl-cyclobutyl-Correct
(C)-cyclobutyl-
(D)-cyclobutyl-

Answer: (B)

Solution

Magnesium inserts selectively into the weaker C–Br bond (bromine is a better leaving group/weaker bond than C–Cl) to form the Grignard reagent at that position, leaving the C–Cl bond intact.

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Question ID VK-148669