Question

Which of the following will not be soluble in sodium hydrogen carbonate?

• A. Benzenesulphonic acid
• B. Benzoic acid
• C. o-Nitrophenol
• D. 2, 4, 6-trinitrophenol

Answer 1

Answer: (C)

2.4.6-Trinitro phenol, benzoic acid and benzene sulphonic acid are sobuble in $\text{NaH}{\text{O}}_3$ .

$\text{Acid}+\text{NaHC}{\text{O}}_3\to \text{salt}+H_2\text{C}{\text{O}}_3$

Reaction is possible in forward direction if acid is more acidic then $H_2\text{C}{\text{O}}_3.$

O-nitrophenol is less acidic than $H_2\text{C}{\text{O}}_3$ so it is not soluble in sodium hydrogen carbonate.

$H_{2}C{O}_3$ is more acidic then and reaction proceed in strong acid to weak acid so, above reaction is not feasible forward direction