c
While \(2,4,6\) -trinitrophenol, benzoic acid and benzene sulphonic acid are soluble in \(\mathrm{NaHCO}_{3}\)

Infact,

\(A c i d+N a H C O_{3} \longrightarrow S a l t+H_{2} C O_{3}\)

This reaction is possible in forward direction if acid is more acidic than \(H_{2} C O_{3}\) o-nitrophenol is less acidic than \(H_{2} C O_{3} .\) Hence, it is not soluble in sodium hydrogen carbonate.