Some ketones have historical common names,
the simplest dimethyl ketone is called acetone Alkyl phenyl
ketones are usually named by adding the name of acyl group as
prefix to the word phenone For example
(b) IUPAC names
The IUPAC names of open chain aliphatic aldehydes and ketones
are derived from the names of the corresponding alkanes by
replacing the ending –e with –al and –one respectively In case of
aldehydes the longest carbon chain is numbered starting from the
carbon of the aldehyde group while in case of ketones the
numbering begins from the end nearer to the carbonyl group