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alkane-CnH2n+2 alkene-CnH2n alkyl-CnH2n+1 aldehyde-R-CHO where R is any alkyl group ketone-R-CO-R where R is any alkyl group cycloalkane-CnH2n. svetlana Â· 5 years ago.
IUPAC prescribes the following nomenclature for aldehydes: 1  Acyclic aliphatic aldehydes are named as derivatives of the longest carbon chain containing the aldehyde group. 2  Thus, HCHO is named as a derivative of methane, and CH 3 CH 2 CH 2 CHO is named as a derivative of butane.