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Question

Chemistry Question on Haloalkanes and Haloarenes

For SN 2 reaction, the increasing order of the reactivity of the following alkyl halides is:
(A) CH3CH2CH2CH2Br (B) CH3CH2CH(Br)CH3 (C) (CH3)3CBr (D) (CH3)2CHCH2Br

A

(A) << (B) << (C) << (D)

B

(A) << (C) << (B) << (D)

C

(B) << (A) << (D) << (C)

D

(C) < (B) < (D) < (A)

Answer

(C) < (B) < (D) < (A)

Explanation

Solution

For SN2_2 reactions, the reactivity order depends on the steric hindrance. Less steric hindrance favors the SN2_2 mechanism.