Which of the following compounds will not be soluble in sodium bicarbonate?

Which of the following compounds will not be soluble in sodium bicarbonate?
  1. 2, 4, 6 - Trinitrophenol
  2. Benzene sulphonic acid
  3. o - Nitrophenol
  4. Benzoic acid

Solution

o-Nitrophenol is insoluble in sodium hydrogen carbonate because it is less acidic than carbonic acid.While, others being more acidic than H2CO3 dissolve in sodium bi carbonate.

 Hence, the given reaction will not be spontaneous. 

Asked in: JEE Main 2014 (19 Apr Online)

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