Resonating structure of benzyl carbocations are
Relative reactivity of alkyl halides for same alkyl group is
RI > RBr > RCI > RF
2 . Elimination Reactions
Dehydrohalogenation is a β – elimination reaction in which halogen is from α-carbon atom and the hydrogen from the α-carbon according to Saytzeff rule , e . g .,
Ease of dehydrohalogenating among halides 3 ° > 2 ° > 1 °