Benzene was discovered by.....

In electrophilic aromatic substitution reactions of chlorobenzene,the $ortho/para$-directing ability of chlorine is due to its

Answer the following question: $(i)$ Give the isomers of the aromatic hydrocarbon having the molecular formula $C_8H_{10}$.

The rate of nitration will be

For the electrophilic substitution reaction involving sulphonation,which of the following sequences regarding the rate of reaction is true?

Out of benzene,$m$-dinitrobenzene and toluene,which will undergo nitration most easily and why?