Which of the following compounds is least likely to give effervescence of $\mathrm{CO}_{2}$ in presence of aq. $\mathrm{NaHCO}_{3}$ ?

(C) $\mathrm{Ph}-\stackrel{(+)}{\mathrm{NH}_{3}} \stackrel{(-)}{\mathrm{Cl}}$

JEE Main · 2025 · 07 Apr 2025 · Shift 1 · Aldehydes Ketones and Carboxylic Acids

Which of the following compounds is least likely to give effervescence of

CO_{2}

in presence of aq.

NaHCO_{3}

(A)(see structure)
(B)(see structure)
(C) $Ph - NH_{3} (+) Cl (-)$
(D)(see structure)
✓ Correct

Answer: (D)

Solution

Only acids stronger than carbonic acid liberate carbon dioxide from sodium bicarbonate. Picric acid, a phenol bearing three nitro groups, and p-nitrobenzoic acid are both acidic enough, and the anilinium ion is also sufficiently acidic to react. m-Nitrophenol, however, is a much weaker acid than carbonic acid, so it does not displace carbon dioxide from bicarbonate. The compound least likely to give effervescence is m-nitrophenol.

JEE Main · 2025 · 07 Apr 2025 · Shift 1 · Single correct option

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