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Question

Which of the following compounds would not evolve CO2 when treated with NaHCO3 solution?

A
Salicyclic acid
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B
Phenol
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C
Benzoic acid
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D
4-Nitrobenzoic acid
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Solution

The correct option is B Phenol
Carboxylic acid also reacts with weaker bases such as carbonate/bicarbonate and releases CO2.​ This is used to detect the carboxylic group in an organic compound.​ This is known as carbonate/bicarbonate test.​
Generally, those compounds which are more acidic than phenol give carbonate/bicarbonate test.​
Phenol does not decompose sodium carbonate or sodium bicarbonate, i.e, CO2 is not evolved, as phenol is a weaker acid than carbonic acid. Thus option (b) is correct.

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