The compounds that produce \(\mathrm{CO}_{2}\) with aqueous \(\mathrm{NaHCO}_{3}\) solution are : A. B. C. D. E. Choose the correct answer from the options given below :

JEE Main · 2025 · 28 Jan 2025 · Shift 1 · Aldehydes Ketones and Carboxylic Acids

The compounds that produce

CO_{2}

with aqueous

NaHCO_{3}

solution are :
A.
B.
C.
D.
E.

Choose the correct answer from the options given below :

(A)A and C only
(B)A, B and E only
(C)A, C and D only✓ Correct
(D)A and B only

Answer: (C)

Solution

A compound liberates

C O_{2}

from aqueous

N a H C O_{3}

only if it is a stronger acid than carbonic acid (

p K_{a} \approx 6.35

). Benzoic acid (A,

p K_{a} \approx 4.2

) and cyclohexanecarboxylic acid (D,

p K_{a} \approx 4.8

), both carboxylic acids, comfortably clear this bar, and picric acid (C, 2,4,6-trinitrophenol) is acidified so strongly by its three electron-withdrawing nitro groups that its

p K_{a}

drops to about 0.4, well below carbonic acid. Plain phenol (B,

p K_{a} \approx 10

) and 4-methoxyphenol (E, made even less acidic by the electron-donating methoxy group) are both far weaker acids than carbonic acid and react only with strong base, not with bicarbonate. The compounds that liberate

C O_{2}

with

N a H C O_{3}

are A, C and D.

JEE Main · 2025 · 28 Jan 2025 · Shift 1 · Single correct option

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JEE Main · 2025 · 28 Jan 2025 · Shift 1 · Aldehydes Ketones and Carboxylic Acids

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