IUPAC NAME & Common name of C2H5COOH Share with your friends Share 0 Akanksha Ar answered this Dear student , The IUPAC name is propanoic acid. Common name : Ethanecarboxylic acid Regards 1 View Full Answer Aayush Vispute answered this Ethanoic acid & acetic acid 2 Bharath answered this Its propanoic acid....as ethanoic acid -CH3COOH..(eth-2 carbons)....AND HERE IT IS C2H5COOH...SO IT IS propanoic acid....(prop-3 carbons) 1