The test for unsaturation of organic compounds is carried out by treating alkenes with 1% dilute alkaline KMnO4 solution. The colour of KMnO4 is discharged with the formation of a/an:
Correct answer: B. Vicinal glycol
- A. Ethylene glycol
- B. Vicinal glycol
- C. Glyoxal
- D. Oxalic acid
Explanation
This reaction, known as the Baeyer test, involves the syn-dihydroxylation of the alkene's double bond. The purple permanganate is reduced, and the alkene is oxidized to a vicinal glycol (or vicinal diol), a compound with two hydroxyl groups on adjacent carbon atoms.
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About Chemistry of Hydrocarbons
Hydrocarbons are studied through the structures and reactions of alkanes, alkenes, alkynes and aromatic compounds. Coverage includes free radical substitution in alkanes, electrophilic addition to carbon-carbon multiple bonds, benzene substitution, aromatic stability and the difference between addition reactions of alkenes and substitution reactions of benzene.
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