Question

In SN¹ and SN² mechanism the reactivity of halides following order​

Answer 1

The increasing order of the reactivity of the halides for the SN1 reaction is (II)<(I)<(III).

(II) is primary alkyl halide.

(I) is secondary alkyl halide.

Primary alkyl halide is less reactive towards SN1 reaction than secondary alkyl halide.

In (III), the carbocation generated is stabilised due to resonance. Hence, (III) is most reactive towards SN1 reaction.