Question

benzyl chloride undergoes SN1 reaction faster than chlorohexane methyl chloride why

Answer 1

due to resonance .......................

Answer 2

In SN1, the chloride will leave on its own to begin the reaction. The ability of the chloride to leave is directly affected by the stability of the remaining reactant, which in this case will essentially be a benzene ring with a carbocation where the chloride was (b/c the chloride is going to take the entire electron pair that previously formed the bond). This carbocation will be relatively stable because what's left is essentially a benzene ring, meaning the +1 charge is going to be distributed amongst the entire molecule via resonance.