Answer:
The typical
reactions of benzene are electrophilic substitution reactions.
(a)
Nitro \[(-N{{O}_{2}})\] group is
deactivating group(electron withdrawing) than Cl, therefore more the number of
nitro groups, less reactive is the compound.
(b)
Methyl \[(-C{{H}_{3}})\]group is an activating
group(electron donating).
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