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

1. Benzenesulphonic acid
2. Benzoic acid
3. o-Nitrophenol
4. 2, 4, 6-trinitrophenol

Solution

2.4.6-Trinitro phenol, benzoic acid and benzene sulphonic acid are sobuble in $\text{NaH}{\text{O}}_3$ .
$\text{Acid}+\text{NaHC}{\text{O}}_3\to \text{salt}+{\mathrm{H}}_2\text{C}{\text{O}}_3$
Reaction is possible in forward direction if acid is more acidic then ${\mathrm{H}}_2\text{C}{\text{O}}_3.$
O-nitrophenol is less acidic than ${\mathrm{H}}_2\text{C}{\text{O}}_3$ so it is not soluble in sodium hydrogen carbonate.
${\mathrm{H}}_2\mathrm{C}{\mathrm{O}}_3$ is more acidic then and reaction proceed in strong acid to weak acid so, above reaction is not feasible forward direction

Asked in: MHT CET Full Test 1

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