Only alkenes will react and decolourise bromine water
Bromine water is an orange solution of bromine. It becomes colourless when shaken with an alkene. Alkenes can decolourise bromine water, while alkanes cannot
The reaction between bromine and alkenes is an example of a type of reaction called an addition reaction
The bromine is decolourised because a colourless dibromo compound forms
ethene + bromine → dibromoethane
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