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| Alkynes - Ethyne |
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| Ethyne is an unsaturated hydrocarbon with a triple bond. |
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| Ethyne is prepared by the action of water on calcium carbide. |
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| Preparation of ethyne |
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| The gas thus produced is collected by the downward displacement of water. |
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| It is a colourless gas with garlic-like odour when pure. It is soluble in organic solvents. It is poisonous and highly explosive. |
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 Combustion |
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| It burns in air with a sooty flame to produce carbon dioxide and water vapour. The flame is white, sooty and produces an extremely high temperature of 40000C. |
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 Addition reactions |
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| Ethyne undergoes addition reactions to give saturated compounds. |
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| a. Chlorination |
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| b. Bromination |
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 Illuminant in acetylene lamps. |
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 Oxy-acetylene torches for welding metals. |
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 Starting material for the synthesis of organic compounds like acetaldehyde, acetic acid, ethyl alcohol and tetrachloroethane. Tetrachloroethane is a solvent and is also called Westron. |
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