Identify the correct order of reactivity in electrophilic substitution reactions of the following compounds:

 

Due to +I effect $-{\mathrm{CH}}_3$ group to an activating group ${\mathrm{NO}}_2$  has a strong −I & −M effect Cl has a weak −I effect.

In comparison to benzene, nitrobenzene, and chlorobenzene, toluene has a greater electron density.
The overall reactivity ranking is as follows: Ans 2 > 1 > 3 > 4.

Hence, option C is correct.