baeyer's test

Question

Baeyer's reagent (alkaline KMnO₄) is used to test for:

RankGuru · Accepted Answer

**Baeyer's Reagent** is a cold, dilute, **alkaline solution of Potassium permanganate ($KMnO_4$)**.
- Test for Unsaturation: When added to an alkene or alkyne, the purple color of $KMnO_4$ is discharged (decolorized) and a brown precipitate of manganese dioxide ($MnO_2$) forms.
- Reaction: The alkene is converted to a **cis-vicinal glycol** (syn-hydroxylation).
- This test distinguishes alkenes/alkynes from alkanes and aromatic compounds (which do not react under these mild conditions).

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baeyer's test

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