Arrange the following compounds in order of their decreasing reactivity with an electrophile, E^+ (A)chlorobenzene , (B)2,4-dinitrochlorobenzene , (C )p-nitrochlorobenzene

Arrange the following compounds in order of their decreasing reactivit

1.	Arrange the following compounds in order of their decreasing reactivity with an electrophile, E^+ (A)chlorobenzene , (B)2,4-dinitrochlorobenzene , (C )p-nitrochlorobenzene
Answer» C gt B gt A B gt C gt A A gt C gt B A gt B gt C Solution :Electron-withdrawing groups in the benzene ring decrease the reactivity towards electrophilic substitution. Since Cl is a weaker electron-withdrawing GROUP that `NO_2`, therefore , chlorobenzene (A) is more reactive than p-nitrochlorobenzene (C ) which , in turn, is more reactive than 2,4-dinitrochlorobenzene (B), i.e., option (c) is correct.