Which reagent distinguishes ethanol from phenol?
Correct answer: B. Bromine water
- A. Sodium metal
- B. Bromine water
- C. Water
- D. A lighted splint
Explanation
Phenol decolourises bromine water immediately and gives a white precipitate of the tribromo compound, whereas ethanol produces no visible change. Sodium metal is not suitable, since both compounds contain a hydroxyl group and both release hydrogen with it. Neutral iron three chloride is the other reliable distinguishing test.
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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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535 free Alcohols and Phenols MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
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