Presence of a nitro group in a benzene ring
deactivates the ring towards electrophilic substitution
activates the ring towards electrophilic substitution
renders the ring basic
deactivates the ring towards nucleophilic substitution.
Nitro group is an electron withdrawing group which deactivates the benzene ring for electrophilic substitution.
Study 40% syllabus and score up to 100% marks in JEE