The order of reactivity of phenol (I), nitrobenzene (II) and benzene (III) towards nitration is
The order of reactivity of phenol (I), nitrobenzene (II) and benzene (III) towards nitration is
(III) $>$ (I) $>$ (II)
(II) $>$ (III) $>$ (I)
(I) $>$ (III) $>$ (II)
(I) $>$ (II) $>$ (III)
Solution
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
