Question

explain why ethene decolourises bromide water whereas ethene does not? ​

Answer 1

Answer:

Bromine water decolourises unsaturated compounds.Ethene contains double bond and hence it is unsaturated.It reacts with Br to give colourless compound whereas ethaneis saturated compound. ... but Ethane is a saturated hydrocarbon. So it does not Decolourise bromine water.

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Answer 2

Answer:

$\red{Ethene}$ decolourises bromine water as itunderhoes addition reaction while

$\blue{Ethane}$ does not decolourise bromine water as it undergoes substitution reaction.

Reactions:

C2H6 + Br2 --> C2H5Br + HBr

C2H4 + Br2 --> C2H4Br2

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