Choose the false statement from following about SN^1 reaction mechanism

MHT CET 2022 Chemistry question

Choose the false statement from following about reaction mechanism

(A)Intermediate formed during the reaction is a carbocation
(B)It is single step mechanismCorrect
(C)Concentration of nucleophile does not affect the rate of reaction.
(D)Racemization takes place if reaction is carried out at chiral carbon in optically active substance

Answer: (B)

Solution

The (unimolecular nucleophilic substitution) reaction is a two-step mechanism. Step 1 (slow, rate-determining): the C-X bond ionises to give a planar carbocation intermediate. Step 2 (fast): the nucleophile attacks the carbocation from either face. So (A) is true, because a carbocation is formed. (B)

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Question ID VK-093805