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The order of reactivity of phenol (I), nitrobenzene (II) and benzene (III) towards nitration is
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(I) $>$ (III) $>$ (II)
Due to strong $+R$ effect of $-\mathrm{OH}$ group, the electron density in phenol (I) is much more than in benzene (III) while due to the strong $-R$ effect of the $-\mathrm{NO}_2$ group, the electron density in nitrobenzene (II) is much lower than in benzene. Hence, the order of reactivity towards nitration is as
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