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 reactions, the reactivity order depends on the steric hindrance. Less steric hindrance favors the SN2 mechanism.