- ABenzoic acid
- BBenzenesulphonic acid
- CSalicylic acid
- DCarbolic acid (Phenol)
View written solutionFree
Correct answer: D
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Key principle
A compound will liberate with aqueous sodium bicarbonate, , only if it is more acidic than carbonic acid.
The reaction is: and then
So, sufficiently acidic compounds such as carboxylic acids and strong sulphonic acids react with to give brisk effervescence of .
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Check each option
A. Benzoic acid
Benzoic acid is a carboxylic acid, so it reacts with sodium bicarbonate: Hence, it does liberate .
B. Benzenesulphonic acid
Benzenesulphonic acid, , is a strong acid. It reacts readily with sodium bicarbonate: Hence, it does liberate .
C. Salicylic acid
Salicylic acid contains a carboxylic acid group and a phenolic group. The carboxylic acid group reacts with sodium bicarbonate: Hence, it does liberate .
D. Carbolic acid (Phenol)
Phenol is much weaker than carboxylic acids and is less acidic than carbonic acid for this purpose. Therefore, phenol does not react with aqueous sodium bicarbonate.
So, no is liberated.
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Conclusion
The compound that does not liberate with aqueous sodium bicarbonate is:
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Comparison with stored correct answer
Stored correct answer: D
My derived answer: D
Hence, they agree.
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