Which of the following is Bayer's reagent ?
Correct answer: B. Dilute alkaline KMnO4.
- A. Br2/H2O.
- B. Dilute alkaline KMnO4.
- C. ZnCl2/HCl.
- D. Br2/CCl4.
Explanation
Baeyer's reagent is a solution of potassium permanganate (KMnO4) in sodium hydroxide (NaOH) used to test for the presence of unsaturation in organic compounds. The purple color of the permanganate ion is reduced to a brown precipitate of manganese dioxide (MnO2) in the presence of an unsaturated compound.
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About Alkenes
Alkenes are unsaturated hydrocarbons containing a carbon-carbon double bond with sigma and pi components and restricted rotation. Their reactions include electrophilic addition of hydrogen, halogens, hydrogen halides and water, with Markovnikov orientation, oxidation, combustion and polymerisation, while their preparation commonly involves elimination from alkyl halides or alcohols.
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