Four beakers containing ethanol, ethanal, propanone and phenol separately. Aqueous bromine was added to each beaker. A white ppt was produced in one beaker. This beaker contains.
Correct answer: B. Phenol
- A. Ethanol
- B. Phenol
- C. Ethanal
- D. Propanone
Explanation
If bromine water is added to a solution of phenol in water, the bromine water/aqueous bromine is decolarized and a white precipitate is formed which smells of antiseptic. The precipitate is 2,4,6- tribromophenol.
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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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