Solveeit Logo
Login

Question

Chemistry Question on reaction mechanism

Baeyer’s reagent is :

A

Acidic potassium permanganate solution

B

Acidic potassium dichromate solution

C

Cold, dilute, aqueous solution of potassium permanganate

D

Hot, concentrated solution of potassium permanganate

Answer

Cold, dilute, aqueous solution of potassium permanganate

Explanation

Solution

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.