12.9 Qualitative Analysis Of Organic Compounds

The elements present in organic compounds are carbon and hydrogen. In addition to these, they may also contain oxygen, nitrogen, sulphur, halogens and phosphorus. 12.9.1 Detection of Carbon and Hydrogen Carbon and hydrogen are detected by heating the compound with copper(II) oxide. Carbon present in the compound is oxidised to carbon dioxide (tested with lime-water, which develops turbidity) and hydrogen to water (tested with anhydrous copper sulphate, which turns blue). C +2CuO → 2Cu + CO2 2H + CuO → Cu + H2O CO2 + Ca(OH)2 → CaCO3 ↓ +…