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(C) The presence of an electron-releasing group like $-CH_3$,$-OH$,etc.,increases the electron density at the $o/p$ positions and thus makes the benze

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toluene

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(C) The presence of an electron-releasing group like $-CH_3$,$-OH$,etc.,increases the electron density at the $o/p$ positions and thus makes the benzene ring more reactive towards electrophiles. On the other hand,electron-withdrawing groups like $-COOH$,$-NO_2$,etc.,reduce the electron density of the benzene ring,thereby decreasing its reactivity towards electrophilic substitution. Comparing the given compounds: $1$. $-NO_2$ (in nitrobenzene) is a strong electron-withdrawing group. $2$. $-COOH$ (in benzoic acid) is an electron-withdrawing group. $3$. $-H$ (in benzene) is the reference. $4$. $-CH_3$ (in toluene) is an electron-releasing group due to the $+I$ effect and hyperconjugation. Therefore,the order of reactivity towards electrophilic nitration is: $	ext{nitrobenzene} Thus,toluene is the most reactive.

Among the following compounds,the one that is most reactive towards electrophilic nitration is

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