Phenol and ethanol can be distinguish by all except:
Correct answer: B. Na-metal
- A. lodoform test
- B. Na-metal
- C. Aq. Br2
- D. Lucas-reagent
Explanation
Phenol reacts with NaOH, gives Bromine water test but alcohol doesn't give Bromine water test and doesn't react with NaOH as pKa of alchohol is more than that of H2O but Na reacts with both phenol and alchohol so Na doesn't distinguish phenol and alchohol. Hence, B is correct
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About Alcohols and Phenols
Alcohols are classified as primary, secondary or tertiary and studied through their hydrogen bonding, acidity, oxidation and reactions with active metals, acids and halogenating agents. Phenols require separate treatment because the hydroxyl group is attached to an aromatic ring, making their acidity and electrophilic substitution different from ordinary alcohols.
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