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Question

Which of the folllowing hydrocarbon can decolourise bromine water?

A
Methane
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B
Ethane
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C
Propene
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D
Isobutane
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Solution

The correct option is C Propene
Saturated hydrocarbon do not react with bromine water whereas unsaturated hydrocarbon decolourises it.
Bromine water test is also performed for distinguishing saturated and unsaturated hydrocarbon.
Here propene is unsaturated hydrocarbon and it decolourises bromine water.

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