Separation of alkane, alkene and alkyne  

         The gaseous mixture is passed through ammonical cuprous chloride solution. The alkyne (acetylene) reacts with Cu₂Cl₂ and forms a red precipitate. It is filtered. The alkyne or acetylene is recovered by decomposition of the precipitate with an acid.

         The remaining gaseous mixture is passed through concentrated H₂SO₄. Alkene is absorbed. The Hydrogen sulphate derivatives is heated at 170^oC to regenerate ethene.

            The methane or ethane is left behind unreacted.

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