Which one is most reactive towards S_N1 reactions?

JEE Main Chemistry question

Which one is most reactive towards reactions?

(A) (diphenylmethyl bromide)Correct
(B) (1-phenylethyl bromide)
(C) (an alternative monophenyl secondary bromide)
(D) (benzyl bromide)

Answer: (A)

Solution

reactivity is governed by the stability of the carbocation formed on ionisation. The cation formed from (diphenylmethyl bromide) is stabilised by resonance delocalisation into two separate aromatic rings, making

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Question ID VK-148208