Naming Aromatic Compounds Disubstituted benzenes Named using one of the prefixes 1.ortho-(o-) Ortho-disubstituted benzene has two substituents in a 1,2 relationship 2.meta-(m-) ■ Meta-disubstituted benzene has its substituents in a 1,3 relationship 3.para-(p-） Para-disubstituted benzene has its substituents in a 1,4 relationship ortho-Dichlorobenzene meta-Dimethylbenzene para-Chlorobenzaldehyde 1,2 disubstituted (meta-xylene) 1,4 disubstituted 1,3 disubstituted Disubstituted benzenes ▪ Named using one of the prefixes 1. ortho- (o-) ▪ Ortho-disubstituted benzene has two substituents in a 1,2 relationship 2. meta- (m-) ▪ Meta-disubstituted benzene has its substituents in a 1,3 relationship 3. para- (p-) ▪ Para-disubstituted benzene has its substituents in a 1,4 relationship Naming Aromatic Compounds