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  4. Which of the following will decolourise alkaline KMnO4 solution?

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Q. Which of the following will decolourise alkaline $KMnO_4$ solution?

IIT JEEIIT JEE 1980Hydrocarbons

Solution:

Unsaturated compounds which contain $C = C$ or $C \equiv C$, decolourises the purple colour of alkaline $KMnO_4$ solution.

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