unsaturated hydrocarbon definition
(December 2009). Unsaturated hydrocarbons are hydrocarbons that have double or triple covalent bonds between adjacent carbon atoms. Those with at least one carbon to carbon double bond are called alkenes and those with at least one carbon to carbon triple bond are called alkynes.The position of the double or triple bond is shown by a number written either at the start of the name, or just before the-ene or-yne suffix (e.g. pent-2-ene and 2-butyne).lkenes and alkynes with more than one double or triple bond respectively are named with a prefix preceding the-ene or-yne (e.g. 2,4-pentadiene). Unsaturated hydrocarbons with both double and triple bonds have the suffix-enyne and are handled in a similar manner.