The IUPAC nomenclature of CH₃-CHO is _____________.

 

The "-al" suffix in organic nomenclature indicates that a compound is an aldehyde, which is a functional group that contains a carbon atom double-bonded to an oxygen atom and single-bonded to a hydrogen atom.

In the given compound CH3-CHO, the functional group is an aldehyde group (-CHO), which is attached to a two-carbon chain. The two-carbon chain is named as "eth-" since it contains two carbon atoms. The aldehyde group is named as "anal" since it replaces the -e at the end of the alkane name. Therefore, the IUPAC name of CH3-CHO is "ethanalnal.