The maximum number of -NO_2 groups that can b | vedclass

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(C) The nitration of benzene is an electrophilic aromatic substitution reaction.Each $-NO_2$ group introduced into the benzene ring is strongly electr

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$3$

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(C) The nitration of benzene is an electrophilic aromatic substitution reaction.Each $-NO_2$ group introduced into the benzene ring is strongly electron-withdrawing,which deactivates the ring towards further electrophilic substitution.After the introduction of three $-NO_2$ groups,the ring becomes so deactivated that further nitration under standard conditions is extremely difficult.Therefore,the maximum number of $-NO_2$ groups that can be introduced by direct nitration is $3$,resulting in $1,3,5$-trinitrobenzene.

The maximum number of $-NO_2$ groups that can be introduced into benzene by direct nitration is usually

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