Chemistry - GOC Question with Solution | TestHub

Only an acid stronger than carbonic acid ($\mathrm{p}{K}_{\mathrm{a}}$ ≈ 6.4) can liberate $\mathrm{C}{\mathrm{O}}_2$ from bicarbonate. 4-Nitrobenzoic acid ($\mathrm{p}{K}_{\mathrm{a}}$ 3.4) is stronger and evolves $\mathrm{C}{\mathrm{O}}_2$. Phenol ($\mathrm{p}{K}_{\mathrm{a}}$ ≈ 10) and cyclohexanol ($\mathrm{p}{K}_{\mathrm{a}}$ ≈ 17) are weaker acids than carbonic acid, and benzamide is not acidic at all.