Baeyer’s reagent is :
- Acidic potassium permanganate solution
- Acidic potassium dichromate solution
- Cold, dilute, aqueous solution of potassium permanganate
- Hot, concentrated solution of potassium permanganate
The Correct Option is C
Solution and Explanation
Baeyer's reagent is a cold, dilute, alkaline solution of potassium permanganate KMnO4.
It is a powerful oxidizing agent and is used as a test for unsaturation (presence of double or triple bonds) in organic compounds. The permanganate ion MnO4- is a deep purple color.
When it reacts with an unsaturated compound, the purple color disappears, and a brown precipitate of manganese dioxide MnO2 forms. This decolorization of the permanganate solution is a positive test for unsaturation. It's important that the solution be cold and dilute; otherwise, the reaction may proceed too vigorously, and the permanganate may oxidize the organic compound further.
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