Question

Benzyl chloride in highly reactive towards SN1 reaction . why ?

Answer 1

Benzyl chloride is highly reactive and can undergoes the Sn1 reaction as the sn1 reaction occurs when there is a stable carbocation formation occur .And upon losing the chlorine the benzyl chloride  forms the benzyl carbocation which have the resonance stabilization . Due to having the resonance effect the benzyl carbocation is the considered to be stable causing it to undergoes the Sn1 reaction easily.

Hope this will help you to understand the reason you asked.