How to distinguish ethylene and butane in practice?

univerkov | March 2, 2021 | education

You can distinguish between ethylene and butane using the characteristic reactions of alkenes. These reactions are: 1) Wagner’s reaction; 2) reaction with bromine water. Ethylene refers to alkenes, and butane refers to alkanes, so butane will not enter into these reactions. Let’s write the reactions (only ethylene will react): 1) 3C2H4 + 2KMnO4 + 4H2O -> 3CH2OH-CH2OH + 2MnO2 + 2KOH. Discoloration of the potassium permanganate solution occurs, a brown precipitate of manganese (IV) oxide precipitates; 2) C2H4 + Br2 -> CH2Br-CH2Br. Discoloration of bromine water occurs.

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