−Cl and −CH3 groups are o and p directing. They are electron releasing due to +E and +M effects. Further since such groups increase electron density in the nucleus, they facilitate further electrophilic substitution and hence known as activating group. The activating effect of these groups is in order of −CH3>−X but chlorine exceptionally deactive the ring due to strong −I effect. Hence, it is difficult to carry out substitution in chlorobenzene than in benzene. Further −NO2 is a deactivating group hence deactivates the benzene nucleus, i.e. hinder the further substitution. Thus nitrobenzene undergo electrophilic substitution with a great difficulty hence the correct order will be 
JEE Main 2013 — Chemistry Organic Chemistry
2013mcqmedium
Given 
In the above compounds correct order of reactivity in electrophilic substitution reactions will be:
Official previous-year question
Held on 25 Apr 2013 · Verified 6 Jul 2026.
Options
- A
B>A>C>D
- B
D>C>B>A
- C
A>B>C>D
- D
B>C>A>D
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