There is a solution of p-hydroxybenzoic acid and p-amino benzoic acid . Discuss one method by which we can separate them and also write down the confirmatory test of the functional groups present .

Explanation

For the separation of p-hydroxy benzoic acid and p-aminobenzoic acid with a solution, the solution is treated with HCl. Therefore, p- aminobenzoic acid is remains in solution in form of ammonium salt, while p- hydroxybenzoic acid is not soluble (non -soluble, so it is separated easily)

Test : 1. With `NaHCO_(3)` both evolve effervescences

Test 2. Azodye test: p-aminobenzoic acid gives azodye test while p- hydroxybenzoic acid does not give azodye test.
Test: 3. Liebermann nitroso test: p-hydrxy benzoic acid gives Liebermann nitroso test, while p- amino benzoic acid does not give Lieberman nitroso test.