The test for unsaturated compounds
1 mark · EasyState the colour change observed when bromine water reacts with ethene.
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The orange colour of bromine water disappears (becomes colourless).
Also accept: The solution becomes colourless; Bromine water is decolourised; Orange colour disappears
Common mistakes: The solution becomes clear; No change
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Marking points
B1 · 1 mark · Orange colour of bromine water disappears / becomes colourless.
Worked solution
When ethene is added to bromine water, the orange colour of bromine water disappears and the solution becomes colourless.