QuestionOrganic / SN1 reactivity
The relative order of reactivity of the following chlorides in SN1 reaction is:
- (a) 2 > 1 > 3
- (b) 3 > 2 > 1
- (c) 1 > 2 > 3
- (d) 1 > 3 > 2
Answer: (c) 1 > 2 > 3
SN1 rate follows benzyl cation stability. p-OMe (+R) stabilises most; p-NO₂ (−R, −I) destabilises. 1 > 2 > 3 → (c).