Which of the following compounds would undergo SN1 reaction faster and why?


Compound (B) will give SN1 reaction faster than compound (A) because  SN1 reaction

will only depend upon the stability of carbocation. Benzyl chloride on onisation gives C6H5C+H2 carbocation which is resonance srabilised while the carbocation obtained from compound

(A)is not stabilised by resonance.