Phenol can be distinguished from alcohol by adding:
Correct answer: A. Br2/H2O
- A. Br2/H2O
- B. FeSO4
- C. Cl2/H2O
- D. FeCl3
Explanation
Explanation:An aqueous solution of phenol reacts with bromine water to give white ppt of 2,4,6-tribromophenol . This is a test for presence of phenol. As a result, it can be used to differentiate between phenol and alcohol. FeSO4 does not react with either phenol or alcohols in a way that can be used to distinguish them from each other.Both phenol and alcohols can react with chlorine water to give a color change, but this test is not specific to phenol and cannot be used to distinguish it from alcohols. Phenols and alcohols react with FeCl3 to form a colored complex, known as ferric phenoxide. This test is used to detect the presence of Phenols, but it cannot be used to distinguish between phenols and alcohols.
This question appeared on the UHS MDCAT 2009 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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