Baeyer's reagent is

* Cold dilute alkaline KMnO4 is called Baeyers reagent.* Baeyers reagent is used for Synhydroxylation.* The addition of two "OH" groups across the double bond is called hydroxylation.* Baeyers reagent acts as oxidising agent.* Alkenes decolourises the KMnO4 pink colour,hence KMnO4 is used to detect the unsaturation in the given organic compound.