The compounds that produce CO2 with aqueous NaHCO3 solution are: [2025]

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Solution

Q.
The compounds that produce ${CO}_{2}$ with aqueous ${NaHCO}_{3}$ solution are: [2025]

Choose the correct answer from the options given below:

1 (A), (C) and (D) only

2 (A) and (C) only

3 (A), (B) and (E) only

4 (A) and (B) only

Ans.
(1)

$\begin{matrix} Acid & + & {NaHCO}_{3} & \to & Salt & + & H_{2} {CO}_{3} \\ unstable \\ ↓ \\ {CO}_{2} + H_{2} O \end{matrix}$

Those acids which are stronger than $H_{2} {CO}_{3}$ evolve ${CO}_{2}$ with ${NaHCO}_{3}$ . Carboxylic acids (A and D) are stronger acids than $H_{2} {CO}_{3}$ , hence evolve ${CO}_{2}$ with ${NaHCO}_{3}$ . Phenol (B) is weaker acid than $H_{2} {CO}_{3}$ , hence does not evolve ${CO}_{2}$ with ${NaHCO}_{3}$ . Presence of three nitro groups (strong –M and –I group) makes (C) stronger acid than $H_{2} {CO}_{3}$ , hence it evolves ${CO}_{2}$ with ${NaHCO}_{3}$ . Presence of $- {OCH}_{3}$ (+M group) makes (E) weaker acid than $H_{2} {CO}_{3}$ , hence it does not evolve ${CO}_{2}$ with ${NaHCO}_{3}$ .

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