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(D) $NaHCO_3$ is a weak base. It reacts with acids that are stronger than carbonic acid ($H_2CO_3$,$pK_a \approx 6.35$).Among the given compounds:$1$.

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Benzenesulfonic acid

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(D) $NaHCO_3$ is a weak base. It reacts with acids that are stronger than carbonic acid ($H_2CO_3$,$pK_a \approx 6.35$).Among the given compounds:$1$. Benzoic acid $(pK_a \approx 4.2)$$2$. Phenol $(pK_a \approx 10)$$3$. $p$-Nitrophenol $(pK_a \approx 7.15)$$4$. Benzenesulfonic acid $(pK_a \approx -2.5)$Since benzenesulfonic acid is the strongest acid among the options,it is the most reactive with $NaHCO_3$.

Which of the following compounds is most reactive with $NaHCO_3$?

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