Chemistry - GOC Question with Solution | TestHub
ChemistryGOCAcid BaseMedium2 minQB
ChemistryMediumsingle choice
Which of the following compounds does NOT react with NaHCO₃ to evolve CO₂ gas?
(A) 
(B) 
(C) 
(D) 
Options:
Answer:
B
Solution:
A compound liberates CO₂ from NaHCO₃ only if it is a stronger acid than carbonic acid (pKa ≈ 6.4). Benzenesulfonic acid (pKa ≈ -2), picric acid (pKa ≈ 0.3) and benzoic acid (pKa 4.2) are all stronger, so they evolve CO₂. Phenol (pKa ≈ 10) is weaker than carbonic acid, so it does not react with NaHCO₃.
Stream:JEESubject:ChemistryTopic:GOCSubtopic:Acid Base
⏱ 2mℹ️ Source: QB
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