Chemistry - Halogen Derivative Question with Solution | TestHub

For ${\mathrm{S}}_{\mathrm{N}}2$ reaction, the order of reactivity is methyl halide $>1^{\circ }$ halide $>2^{\circ }$ halide $>$ $3^{\circ }$ halide. Primary allylic and primary benzylic halides may react predominantly either by ${\mathrm{S}}_{\mathrm{N}}1$ or ${\mathrm{S}}_{\mathrm{N}}2$ mechanism.