Baeyer’s reagent is an alkaline solution of cold potassium permanganate of violet colour solution. It is a strong oxidizing agent. As this solution interacts with a double bond compound the colour disappears and becomes colourless.
Properties of KMNO4:
- It dissolves in water to give intensely pink or purple solutions.
- On evaporation, it leaves prismatic purplish-black glistening crystals.