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  • When  solution (1% alkaline) is added to an unsaturated compound, the colour changes toOption: 1</strong

When KMnO_4 solution (1% alkaline) is added to an unsaturated compound, the colour changes to

Option: 1

Violet


Option: 2

Crimson red


Option: 3

dark brown


Option: 4

None of these


Answers (1)

best_answer

As we have learnt,

Baeyer's test for Unsaturation

Unsaturated hydrocarbon + 1% alkaline KMnO_4 Solution leads to a discoloration in Pink Color of KMnO_4

Alkenes react with potassium manganate(VII) solution in the cold. The colour change depends on whether the potassium manganate(VII) is used under acidic or alkaline conditions.

If the potassium manganate(VII) solution is acidified with dilute sulphuric acid, the purple solution becomes colourless.

If the potassium manganate(VII) solution is made slightly alkaline (often by adding sodium carbonate solution), the purple solution first becomes dark green and then produces a dark brown precipitate.

Therefore, Option(3) is correct.

Posted by

Rishi

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