Baeyer's reagent : used in organic chemistry as a qualitative test for the presence of unsaturation, such as double bonds or triple bond .
The bromine test is also able to determine the presence of unsaturation.
Baeyer's reagent is an alkaline solution of potassium permanganate, which is a powerful oxidant Reaction with double or triple bonds (-C=C- or -C≡C-) in an organic material causes the color to fade from purplish-pink to brown.
It is a syn addition reaction.
Aldehydes and formic acid (and formic acid esters) also give a positive test
The brown solid manganese(IV) oxide precipitates out of solution when potassium permanganate reacts with a double or triple bond.
Notes : Baeyer's reagent, named after the German organic chemist Adolf von Baeyer
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