Question

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

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

Answer 1

Answer: (C)

o-nitrophenol

Answer 2

While 2,4,6-trinitrophenol, benzoic acid and
benzene sulphonic acid are soluble in $NaHCO_3.$
Infact,
$\, \, \, \, \, Acid+NaHCO_3 \longrightarrow Salt+H_2 CO_3$
This reaction is possible in forward direction if acid
is more acidic than $H_2 CO_3$ o-nitrophenol is less
acidic than $H_2 CO_3.$ Hence, it is not soluble in
sodium hydrogen carbonate.