Chemistry - Halogen Derivative Question with Solution | TestHub

${\mathrm{S}}_{\mathrm{N}}1$reaction rate depends upon the stability of the carbocation, as carbocation formation is the rate determining step compound (ii), forms at$2°$allylic carbocation which is the most stable, the next stable carbocation is formed from (iii), it is a$2°$carbocation, (i) forms the least stable$1°$carbocation, the order of reactivity is thus,