Arrange the following set of compounds in order of their decreasing relative reactivity with an electrophile, E+ :

Arrange the following set of compounds in order of their decreasing relative reactivity with an electrophile, E+ :
(a) Chlorobenzene, 2, 4-dinitrochlorobenzene, p-nitrochlorobenzene

The order of reactivity towards electrophile E+ in order of their decreasing relative reactivity is
(a) Chlorobenzene > p-nitrochlorobenzene, > 2,4-dinitrochlorobenzene