Chemistry - Halogen Derivative Question with Solution | TestHub

Key Idea Alkyl halides are more reactive towards nucleophilic substitution. Reactivity depends upon the stability of carbocation intermediate formed. Among the given halides, aryl halide $\left({\mathrm{C}}_6{\mathrm{H}}_5\mathrm{X}\right)$ is least reactive towards nucleophile as in it the $\mathrm{C}-\mathrm{X}$ bond acquire some double bond character due to resonance. Presence of electron withdrawing groups like $-{\mathrm{NO}}_2$ at ortho and para positions facilitate the nucleophilic displacenent of $-\mathrm{X}$ of aryl halide. Among alkyl halides, $3^{\circ }$ halides are more reactive as compared to $2^{\circ }$ halides due to the formation of more stable carbocation. Hence, the order of reactivity of $\mathrm{C}-\mathrm{X}$ bond towards nucleophile is as