Question: which one of the following will not be soluble in sodium hydrogen carbonate?
Answer: C. While 2,4,6-trinitrophenol, benzoic acid and benzene sulphonic acid are soluble in NaHCO3. This reaction is possible in the forward direction if acid is more acidic than H2CO3.o-nitrophenol is less acidic than H2CO3. Hence, it is not soluble in sodium hydrogen carbonate.