Question

Which of the following will NOT undergo S_N1 reaction with OH^- ?

(1) 

(2) CH₂ = CH – CH₂Cl

(3) (CH₃)₃CCl

(4) 

Answer 1

Ans. (4) 

Sol. Primary alkyl halide does not give SN1 reaction.

Answer 2

Option 4 SN1 mechanism depends on stability
Since 4 is less stable than all other options it doesn't not undergo SN1 mechanism

Answer 3

Option 1 is correct bcoz after formation of carbocation on CH2 the carbocation shows resonant structure