A test tube contains a brown liquid in it. The colour of liquid remains the same when methane is added to itbut it disappears when ethane is passed through it. Suggest the name of brown liquid. Write the chemical equation involved.
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The brown liquid seems to be bromine dissolved in water. Methane (CH4) is a saturated hydrocarbon and does not react with bromine.
Ethene C2H4 being unsaturated in nature, decolourises bromine and its colour therefore, disappears .
Ch2=ch2+br2----} ch2-ch2
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Br. Br
Pls see attach ment for seeing wa better
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