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(C) Compounds that are stronger acids than carbonic acid ($H_2CO_3$,$pK_a \approx 6.35$) will react with $NaHCO_3$ to evolve $CO_2$ gas.Let us evaluat

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$7$

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(C) Compounds that are stronger acids than carbonic acid ($H_2CO_3$,$pK_a \approx 6.35$) will react with $NaHCO_3$ to evolve $CO_2$ gas.Let us evaluate each compound:$I$: $3$-Nitrophenol $(pK_a \approx 8.3)$ - Weaker acid,no reaction.$II$: $2,4$-Dinitrophenol $(pK_a \approx 4.1)$ - Stronger acid,reacts.$III$: $4$-Hydroxybenzoic acid $(pK_a \approx 4.5)$ - Stronger acid,reacts.$IV$: $4$-Methylbenzoic acid $(pK_a \approx 4.4)$ - Stronger acid,reacts.$V$: $4$-Chlorophenol $(pK_a \approx 9.4)$ - Weaker acid,no reaction.$VI$: $2,4$-Dinitrotoluene - Not an acid,no reaction.$VII$: $4$-Hydroxybenzenesulfonic acid - Contains $-SO_3H$ group,stronger acid,reacts.$VIII$: $4$-Sulfobenzoic acid - Contains $-SO_3H$ and $-COOH$ groups,stronger acid,reacts.$IX$: Squaric acid $(pK_a \approx 1.5)$ - Stronger acid,reacts.$X$: Maleic acid $(pK_a \approx 1.9)$ - Stronger acid,reacts.The compounds that react are $II, III, IV, VII, VIII, IX, X$. Total count is $7$.

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