Functional Groups Ester -oate 0 CH3COCH3 Methyl ethanoate Thioester -thioate 0 CH3CSCH3 Methyl ethanethioate Amide -amide CH3CNH2 Ethanamide Acid chloride oyl chloride 0 CH3CCI Ethanoyl chloride Carboxylic acid -oic 00 anhydride anhydride CH3COCCH3 Ethanoic anhydride "The bonds whose connections aren't specified are assumed to be attached to carbon or hydro- molecule.Functional Groups