Unsaturated hydrocarbons that contain one or more triple carbon-carbon bonds in their molecules. In systematic chemical nomenclature alkyne names end in the suffix -yne. Alkynes that have only one triple bond form a homologous series: ethyne (acetylene), CH≡CH, propyne, CH3CH≡CH, etc. They can be made by the action of potassium hydroxide in alcohol solution on haloalkanes containing halogen atoms on adjacent carbon atoms; for example:RCHClCH2Cl+2KOH → 2KCl+2H2O+RCH≡CH Like alkenes, alkynes undergo addition reactions.
RCHClCH2Cl+2KOH → 2KCl+2H2O+RCH≡CH
http://www.acdlabs.com/iupac/nomenclature/79/r79_53.htm Information about IUPAC nomenclature