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Which compound can quickly decolourise bromine water?

Answer and explanation

Correct answer: Ethene

Bromine water is a common test for carbon-carbon unsaturation. Ethene contains a C=C double bond, which reacts readily with bromine in an addition reaction; bromine is consumed and its orange-brown colour disappears. Therefore option A is correct. Ethane and methane are saturated hydrocarbons and do not rapidly decolourise bromine water under ordinary test conditions. Sodium chloride is ionic and does not provide an unsaturated bond.

Related tags

Bromine WaterEtheneAddition ReactionHydrocarbonsCarbon And Its CompoundsScienceClass 10 Mcq

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