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How can you differentiate between ethane and ethene?

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How can you differentiate between ethane and ethene?

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Answer. Ethane and ethene can be identified by KMnO4 test. Ethene decolorizes the pink colour of acidified dilute solution of potassium permanganate .While ethane do not give this test.
3CH2=CH2    +   2KMn04 +   4H2O ——-   3H2C—CH2   +   2MnO2 + 2KOH
                                                  OH OH
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