Question

Benzyl bromide is a primary halide but it undergoes sn1 substitution about as fast as most tertiary halides.explain​

Answer 1

Benzyl bromide C6H5-CH2-Br readily dissociates into the ions C6H5-CH2(+) + Br(-) — this is the rate limiting step of the SN1 reaction — because the benzyl cation C6H5-CH2(+) is stabilized by resonance as shown in this image: The Resonance Stabilization of the Benzyl Carbocation.