91Ó°ÊÓ

It is a nucleophilic substitution reaction in which an old bond is broken and a new bond is formed both processes occur simultaneously. Hence, it’s a single-step reaction.

The two reacting species are involved in the rate-determining steps.

TheS_N2 reaction occurs with the primary alkyl halide but here the alkyl halide is secondary so that’s why S_N2 reaction cannot occur and these products are wrong:

It is a nucleophilic elimination reaction in which an old bond is broken and a new bond is formed both the process occur simultaneously and no intermediate is formed.

Here, the carbon-hydrogen or halogen bond breaks to form a new double bond. Hence, it’s a single-step reaction.

E2 reaction occurs with the secondary alkyl halide where deprotonation of hydrogen occurs with the removal of halide ion and alkene formation occurs as shown:

Elimination reaction