Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Suman Kumar
Since Benzene generally undergo eletrophilic substitution as benzene is eletron rich.
So in order to go for nucleophilic reaction in Benzene more the number of eletron withdrawing group more easy will be the reaction
Now your option III has 3NO2 group