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Among the following compounds, the onele that gives (give) effervescence with aqueoug $\mathrm{NaHCO}_{3}$ solution is (are) 
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The correct answer is:
I and II
Only carboxylic acids and their derivatives like anhydride are capable to give effervescence with aqueous $NaHCO_{3}$ solution, because they are more acidic as compared to $\mathrm{H}_{2} \mathrm{CO}_{3}$ (carbonic acidi-
$\mathrm{IICH}_{3} \mathrm{COOH}+\mathrm{NaHCO}_{3}$
$$
\longrightarrow \mathrm{CH}_{3} \mathrm{COONa}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2}
$$
$1\left(\mathrm{CH}_{3} \mathrm{CO}\right)_{2} \mathrm{O}+2 \mathrm{NaHCO}_{3}$
$$
\longrightarrow 2 \mathrm{CH}_{3} \mathrm{COONa}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2}
$$
$\mathrm{IICH}_{3} \mathrm{COOH}+\mathrm{NaHCO}_{3}$
$$
\longrightarrow \mathrm{CH}_{3} \mathrm{COONa}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2}
$$
$1\left(\mathrm{CH}_{3} \mathrm{CO}\right)_{2} \mathrm{O}+2 \mathrm{NaHCO}_{3}$
$$
\longrightarrow 2 \mathrm{CH}_{3} \mathrm{COONa}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2}
$$
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