Naming Aldehydes and Ketones TABLE 14.1 Common Names of Some Simple Aldehydes Formula Common name Systematic name HCHO Formaldehyde Methanal CH3CHO Acetaldehyde Ethanal H2C-CHCHO Acrolein Propenal CH3CH-CHCHO Crotonaldehyde But-2-enal CHO Benzaldehyde Benzenecarbaldehyde Cengage Learing.All Rights Reserved.Naming Aldehydes and Ketones