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 The
substituents are prefixed in alphabetical order along with numerals
indicating their positions in the carbon chain The same applies to
cyclic ketones, where the carbonyl carbon is numbered one