JEE Main Chemistry question

Which of the following cannot show an SN1 reaction?

(A)A highly branched (tertiary) alkyl halide
(B)A benzylic halide
(C)A vinyl/alkynyl halide (X attached to an sp²/sp carbon of a multiple bond)Correct
(D)A simple primary alkyl halide

Answer: (C)

Solution

SN1 requires ionization to a relatively stable carbocation. Vinyl (and alkynyl) cations are extremely unstable and essentially

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Question ID VK-139424