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Paramjeet verma Best Answer
C6H6 and C6D6 have same same reactivity because r.d.s is formation of intermediate and not the breaking of C-H or C-D bond. So both reacts equally. Benzene with higher electron density in ring reacts faster with Electrophiles. Among chlorobenzene and nitrobenzene, nitrobenzene reacts slower because NO2 is a strong EWG and thus deactivates the benzene ring (making it poor in electron density). So the correct option is (d)