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4 is a lighter phenol and B is an aromatic carboxylic acid. Separation of a mixture of 4 and B can be carried out easily by using a solution of

1. (a) Sodium hydroxide
2. (b) Sodium sulphate
3. (c) Calcium chloride
4. (d) Sodium bicarbonate

Correct answer: (d) Sodium bicarbonate

Solution

Phenol (4) is weakly acidic and does not react with sodium bicarbonate, while the aromatic carboxylic acid (B) reacts with sodium bicarbonate to form a soluble salt. This difference allows their separation.

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