Phenol gives which colored precipitate with aqueous Br₂?
Correct answer: B. white ppt
- A. red ppt
- B. white ppt
- C. blue ppt
- D. orange ppt
Explanation
Phenol reacts with bromine water to give a white precipitate of 2,4,6 tribromophenol, and the orange colour of the bromine disappears. The OH group activates the ring so strongly that substitution occurs at all three ortho and para positions without a catalyst.
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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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