-COOH & gt； -SO3H & gt； -COOR & gt； -Cox>-ConH2 > -COOCO->； -CN & gt； -CHO & gt； -CO->； -Oh & gt-SH & gt；; -NH2 & gt； -C three c->-c = c->; -or & gt-SR & gt；; -F & gt； -Cl & gt； -Br & gt； -I>-r >-NO2 > -No?

That is, carboxylic acid >; Sulfonic acid >; Carboxylate >; Acyl halide > amide > anhydride > nitrile > aldehyde >; Ketone > alcohol > mercaptan > phenol > thiophenol > amine >; Alkynes > olefins > ethers > sulfides > halogenated hydrocarbons > alkanes > nitro compounds >: nitroso compounds?

When the organic compound contains multiple functional groups, the most preferred functional group should be the main functional group, and other functional groups should be used as substituents.

Because amino groups are superior to halogen atoms and alkyl groups, amino groups are the main functional groups. Halogen atom and methyl group as substituents. Because the counterclockwise methyl rank and the lowest chlorine rank are unchanged, they are numbered counterclockwise. Because the priority of methyl group is lower than chlorine, methyl group is listed first, then chlorine, and finally the main body plus functional group is listed.