Phenol reacts with bromine water at room temperature to give an immediate white precipitate of
Correct answer: C. 2,4,6-tribromophenol
- A. bromobenzene
- B. phenyl bromide
- C. 2,4,6-tribromophenol
- D. benzene hexabromide
Explanation
The hydroxyl group is strongly activating and directs substitution to the two and four positions, so all three are brominated at once without any catalyst, whereas benzene itself requires a halogen carrier and gives only monosubstitution. The white precipitate is a standard test for phenol. Activation arises because a lone pair on oxygen is donated into the ring, raising its electron density.
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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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