Which of the following compounds is least lik | vedclass

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(D) The reaction with aqueous $NaHCO_3$ to release $CO_2$ gas occurs only if the compound is more acidic than carbonic acid ($H_2CO_3$,$pK_a \approx 6

Vedclass · Accepted Answer

$3-$Nitrophenol

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(D) The reaction with aqueous $NaHCO_3$ to release $CO_2$ gas occurs only if the compound is more acidic than carbonic acid ($H_2CO_3$,$pK_a \approx 6.35$).$1$. $2,4,6$-Trinitrophenol (Picric acid) is a very strong acid $(pK_a \approx 0.38)$ and readily reacts with $NaHCO_3$.$2$. $4$-Nitrobenzoic acid is a strong organic acid $(pK_a \approx 3.4)$ and reacts with $NaHCO_3$.$3$. $PhNH_3^+ Cl^-$ (Anilinium chloride) is the salt of a weak base and a strong acid. In aqueous solution,it exists as $PhNH_3^+$ and $Cl^-$. $PhNH_3^+$ is a weak acid $(pK_a \approx 4.6)$,which is stronger than $H_2CO_3$,so it can react with $NaHCO_3$ to release $CO_2$.$4$. $3$-Nitrophenol is a weak acid $(pK_a \approx 8.39)$,which is less acidic than $H_2CO_3$ $(pK_a \approx 6.35)$. Therefore,it does not react with $NaHCO_3$ to give effervescence of $CO_2$.

Which of the following compounds is least likely to give effervescence of $CO_2$ in the presence of aqueous $NaHCO_3$?

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