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(C) Sulphonation is an electrophilic aromatic substitution reaction. The rate of this reaction depends on the electron density of the benzene ring. Gr

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Toluene

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(C) Sulphonation is an electrophilic aromatic substitution reaction. The rate of this reaction depends on the electron density of the benzene ring. Groups that donate electrons to the ring (activating groups) increase the electron density and make the ring more susceptible to electrophilic attack. $1$. $CH_3$ group in Toluene is an electron-donating group ($+I$ and hyperconjugation effect),which activates the benzene ring. $2$. $Cl$ in Chlorobenzene is deactivating due to its strong $-I$ effect. $3$. $NO_2$ in Nitrobenzene is a strongly deactivating group due to its $-I$ and $-M$ effects. $4$. Benzene has no substituent. Therefore,Toluene is the most reactive towards electrophilic substitution among the given options.

Amongst the following compounds,the one which is most easily sulphonated is:

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