Question
Give simple tests to distinguish between the following pairs of compounds:
Phenol and Benzoic acid
Solution
Phenol and Benzoic acid: Phenol and benzoic acid can be distinguished from each other by sodium bicarbonate test. To the solutions of both benzoic acid and phenol, add a small amount of solid bicarbonate. Whereas benzoic acid gives brisk effervescence of carbon dioxide which turns lime water milky, phenol does not react.
C6H5COOH + NaHCO3 → C6H5COONa + CO2 ↑ + H2O
C6H5OH + NaHCO3 → No reaction
C6H5COOH + NaHCO3 → C6H5COONa + CO2 ↑ + H2O
C6H5OH + NaHCO3 → No reaction