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how can we distinguish between propane and propyne using chemical tests?/

Asked by ruchira121996 26th March 2013, 7:22 PM
Answered by Expert
Propene is an alkene, whereas propane is an alkane. Thus, propene is an unsaturated molecule, having a carbon-carbon double bond. If you add bromine water, an aqueous solution of bromine, to the test tubes, you can tell which is propene, the alkene. The bromine reacts with and saturates the double bonds in alkenes, and so decolourises. The bromine does not decolourise when added to an alkane as it does not react. So, in conclusion: 
  • Add bromine water (brown) to the test tubes
  • If the bromine water stays brown, the test tube contains propane
  • If the bromine water goes colourless, the test tube contained propene.
Answered by Expert 27th March 2013, 6:49 AM
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