Aldehyde Common Names Use the common name of the acid. Drop -ic acid and add -aldehyde. >1 C:formic acid,formaldehyde >2 C's:acetic acid,acetaldehyde >3 C's:propionic acid,propionaldehyde >4 C's:butyric acid,butyraldehyde. => Chapter 18 11Chapter 18 11 Aldehyde Common Names • Use the common name of the acid. • Drop -ic acid and add -aldehyde. ➢1 C: formic acid, formaldehyde ➢2 C’s: acetic acid, acetaldehyde ➢3 C’s: propionic acid, propionaldehyde ➢4 C’s: butyric acid, butyraldehyde. =>