Oxidation Of Alkenes
Mediumchemistry
Cold, dilute alkaline KMnO4 treatment of alkene gives:
Select the correct option:
Solution
Incorrect! Answer:
Vicinal diol (syn) formation
- Baeyer's Reagent: Cold, dilute, alkaline Potassium Permanganate (KMnO4) is known as Baeyer's reagent.
- Function: It is used for the detection of unsaturation (decolorizes the purple purple solution).
- Chemical Transformation: It adds two hydroxyl (−OH) groups across the double bond via a cyclic manganese ester intermediate.
- Stereochemistry: The addition is syn (both −OH groups add on the same side).
- Product: A vicinal diol (glycol) is formed. For example, ethene → ethylene glycol.
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About This Question
- Subject
- chemistry
- Chapter
- hydrocarbons
- Topic
- oxidation of alkenes
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Vicinal diol (syn) formation
- Baeyer's Reagent: Cold, dilute, alkaline Potassium Permanganate (KMnO4) is known as Baeyer's reagent.
- Function: It is used for the detection of unsaturation (decolorizes the purple purple solution).
- Chemical Transformation: It adds two hydroxyl (−OH) groups across the double bond via a cyclic manganese ester intermediate.
- Stereochemistry: The addition is syn (both −OH groups add on the same side).
- Product: A vicinal diol (glycol) is formed. For example, ethene → ethylene glycol.
This medium difficulty chemistry question is from the chapter hydrocarbons, covering the topic of oxidation of alkenes. It appeared in the 2025 exam.
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