Question

Which of the following is the correct order of decreasing
SN2 reactivity?
(a) R₂CHX > R₃CX > RCH₂X
(b) RCHX > R₃CX > R₂CHX
(c) RCH₂X > R₂CHX > R₃CX
(d) R₃CX > R₂CHX > RCH₂X.
(X is a halogen)

Answer 1

Which of the following is the correct order of decreasing

SN2 reactivity?

Answer is option (c) RCH₂X > R₂CHX > R₃CX

- primary alkyl halides reacts fastest in the SN2 reaction

- the rate of reaction of secondary alkyl halides in SN2 is less than the primary alkyl halides

- the tertiary alkyl halides reacts slowest in the SN2 reaction

-thus the correct order of reactivity is RCH₂X > R₂CHX > R₃CX

- so the correct option is (c)