Tertiary amines have three alkyl groups attached to −N. The parent chain is selected with the highest number of −C atoms. Other alkyl groups are treated as substituents (in this case methyl and ethyl). While naming, the suffix ' e ' of arene is replaced by 'amine' and locant N is written before each substituent name (which follows alphabetical order). ∴ The IUPAC name will be N-ethyl-N-methylbenzenamine.