Question

Primary halide give nucleophillic substitution reaction by sn2 mechanism wheras tertiary halide give nucleophillic substituition reaction by sn1 mechanism perferably meritnation

Answer 1

this is because in tertiary alkyl halide there are three bulky groups attached with carbon atom having halogen atom so chance of attack of nucleophile from back side is not possible while in primary alkyl halide there are not much alkyl groups present with carbon atom containing halogen atom so chance of attack of nucleophile from front side is also possible