JEE Main Chemistry question

Carbocation is not the intermediate in

(A)Hydroboration-oxidation of an alkeneCorrect
(B)Oxymercuration-demercuration of an alkene
(C)Reaction of HCl with
(D)All of the above

Answer: (A)

Solution

Hydroboration proceeds through a concerted four-centred transition state (a true carbocation never forms; the mechanism is essentially a single, syn, non-ionic addition), unlike oxymercuration (bridged mercurinium-ion intermediate, with partial cationic

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Question ID VK-148663