AQA A Level Chemistry

Revision Notes

3.4.4 Test for Unsaturation

Test for Unsaturation

  • Halogens can be used to test if a molecule is unsaturated (i.e. contains a double bond)
  • Br2(aq) is an orange or yellow solution, called bromine water and this is the halogen most commonly used
  • The unknown compound is shaken with the bromine water
  • If the compound is unsaturated, an addition reaction will take place and the coloured solution will decolourise

Hydrocarbons Bromine Water, downloadable AS & A Level Chemistry revision notes

The decolourisation of bromine water by an unsaturated compound as a result of an addition reaction

 

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