The disappearance of the characteristic purple colour of $K M n O_{4}$ in its reaction with an alkene is the test for unsaturation. It is known as

Markownikoff's test

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Baeyer's test

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Wurtz's test

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Grignard test

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Solution

The correct option is B Baeyer's test
The alkaline solution of $K M n O_{4}$ is called Baeyer's reagent, and is used to test hydrocarbon saturation.

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