Chemistry - Halogen Derivative Question with Solution | TestHub

In ${\mathrm{S}}_{\mathrm{N}}2$ reaction, nucleophile transfers electron pair to carbon of substrate, leading to the formation of transition state.${\mathrm{H}}_2\mathrm{O}$ is a neutral nucleophile while ${\mathrm{CN}}^{-},{\mathrm{NH}}_2^{-}$and ${\mathrm{I}}^{-}$are negatively charged nucleophile. Thus, ${\mathrm{H}}_2\mathrm{O}$ cannot behave as a nucleophile for ${\mathrm{S}}_{\mathrm{N}}2$ reaction.