AP EAPCET 04-Jul-2022 Shift 2 Paper

(b) Carboxylic acid can be tested by treating with sodium hydrogen carbonate. The brisk effervescences of CO2 will confirm the test. Further by passing it through lime water, the milky solution too confirms the test.
Ar−COOH+NaHCO3→ArCOO⊖Na⊕+CO2↑+H2O