Alkynes are unsaturated hydrocarbons with at least one carbon-carbon triple bond. They form homologous series with general formula CnH2n–2. The first stable member of alkyne series is ethyne. It is commonly known as acetylene. The presence of triple bond makes alkynes more reactive than alkanes and alkenes. The major sources of alkynes are natural gas and petroleum. Acetylene can be prepared in the laboratory from calcium carbide. It is a colourless gas with an ether like odour. Acetylene undergoes addition reactions, combustion reaction and ozonolysis reaction. Ethane, ethene and ethyne can be distinguished from one another by the use of different chemical reagents.

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