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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Similar questions

Q. 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

Q. Assertion :Bromine in Carbon Tetrachloride test is to distinguish between: Ethene gas & ethane gas. Reason: When this reaction occurs, molecular bromine is consumed, and its characteristic dark redbrown color disappears if bromine is not added in excess. The rapid disappearance of the bromine color is a positive test for unsaturation.

Q. Assertion :Decolourisation of

K M n O_{4}

solution is used as a test for unsaturation. Reason: Alkenes on reaction with cold, dilute aqueous solution of potassium permanganate produce vicinal glycols.

Question 6

A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears.

Which of the following is the correct explanation for the observation?

(a) ${KMnO}_{4}$ is an oxidizing agent, it oxidises ${FeSO}_{4}$ .
(b) ${FeSO}_{4}$ acts as an oxidizing agent and oxidises ${KMnO}_{4}$ .
(c) The colour disappears due to dilution; no reaction is involved.
(d) ${KMnO}_{4}$ is an unstable compound and decomposes in presence of ${FeSO}_{4}$ to a colourless compound.

Q. Fourteen elements following Lanthanum are called Lanthanoids:
(a) What is Lanthanoid contraction? Give reason for it.
(b)

K M n O_{4}

is a purple coloured crystal and it acts as an oxidant. How will you prepare

K M n O_{4}

from

M n O_{2}

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The disappearance of the characteristic purple colour of KMnO4 in its reaction with an alkene is the test for unsaturation. It is known as

The correct option is B Baeyer's testThe alkaline solution of KMnO4 is called Baeyer's reagent, and is used to test hydrocarbon saturation.

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

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.