Aqueous phenol decolorizes bromine water to form a white precipitate. What is the structure of the white precipitate formed?
Correct answer: A. 2,4,6-tribromophenol
- A. 2,4,6-tribromophenol
- B. 2-bromophenol
- C. 4-bromophenol
- D. Phenol
Explanation
Since the OH group has an electron donating effect, it is an ortho-para director. The following reaction occurs:
This question appeared on the UHS MDCAT 2013 paper, which you can sit online with every answer explained.
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About Phenols
Phenols contain a hydroxyl group directly bonded to an aromatic ring, making them more acidic than alcohols because the phenoxide ion is resonance-stabilised. Reactions include ionisation with bases, electrophilic substitution, bromination, nitration and oxidation, with attention to the difference between phenols and aliphatic alcohols.
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