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 When
the aldehyde group is attached to a ring, the suffix carbaldehyde
is added after the full name of the cycloalkane