In chemistry, thesuffix-al is theIUPAC nomenclature used inorganic chemistry to form names ofaldehydes containing the -(CO)H group in the systematic form. It was extracted from the word "aldehyde". With the exception of chemical compounds having a higher priority than it, all aldehydes are named using -al, such as 'propanal'. Some aldehydes also have common names, such asformaldehyde for methanal, acetaldehyde for ethanal. Benzaldehyde does not have a systematic form with -al.