The largest group of aromatic compounds are All those in which a number of with the hydrogens of benzene are replaced by Another atom or group, as in toluene (C6H5CH3) and benzoic acid (C6H5CO2H). Polycyclic aromatic compounds are assemblies of benzene rings that share a typical facet—for instance, naphthalene (C10H8). https://ciciln899net8.wikievia.com/user