Which of the following does NOT liberate carbon dioxide from aqueous sodium hydrogencarbonate?

Aphenol
Bacetic acid
C2,4,6-trinitrophenol
Dbenzoic acid

Answer: A

Carbonic acid has pKa1 of about 6.4. Only acids with pKa below this value can protonate hydrogencarbonate to give CO2. Acetic (4.76), benzoic (4.20) and picric (0.4) acids qualify, but phenol (pKa 10.0) does not.

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