Baeyer's Test
Easychemistry
Baeyer's reagent (alkaline KMnO₄) is used to test for:
Select the correct option:
Solution
Incorrect! Answer:
Unsaturated hydrocarbons
Baeyer's Reagent is a cold, dilute, alkaline solution of Potassium permanganate (KMnO4).
- Test for Unsaturation: When added to an alkene or alkyne, the purple color of KMnO4 is discharged (decolorized) and a brown precipitate of manganese dioxide (MnO2) 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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About This Question
- Subject
- chemistry
- Chapter
- hydrocarbons
- Topic
- baeyer's test
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Unsaturated hydrocarbons
Baeyer's Reagent is a cold, dilute, alkaline solution of Potassium permanganate (KMnO4).
- Test for Unsaturation: When added to an alkene or alkyne, the purple color of KMnO4 is discharged (decolorized) and a brown precipitate of manganese dioxide (MnO2) 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).
This easy difficulty chemistry question is from the chapter hydrocarbons, covering the topic of baeyer's test. It appeared in the 2025 exam.
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