Chemistry - Halogen Derivative Question with Solution | TestHub

(I)$1°$allylic halide have less steric hindrance, so it is more reactive for${\mathrm{S}}_{\mathrm{N}}2$reaction.
(III)$3°$allylic halide gives most stable tertiary allylic carbonium ion so most reactive towards$\mathrm{S}{\mathrm{N}}^1$reaction.