Percentage composition of an organic compound as determined by analysis was carbon 14.5, hydrogen 1.8, chlorine 64.46, and oxygen 19.24. The empirical formula of the compound is

When a solid is heated with fusion mixture of sodium carbonate and potassium nitrate, a yellow precipitate is obtained. It indicates the presence of

When 0.25g of an organic compound is heated with HNO₃ and AgNO₃ in a Carius tube, it gives 0.35 g of silver chlodide. The percentage of chlorine in the compound is

In an experiment, 0.26g of an organic compound, in a quantitative analysis, yielded 0.35 g of barium sulphate. The percentage of sulphur in the substance is

The best method for the separation of naphthalene and benzoic acid from their mixture is

Empirical formula of a compound is CH₂Br. If its vapour density is 93.5, then the molecular formula of the compound is

On ignition, 0.3585 g of platinum, 0.98 g of the platinichloride of diacid base left. The molecular weight of the base is

In the detection of sulphur in an organic compound, sodium nitropruside solution is added to the Lassaigne’s test solution. A purple color is obtained due to the formation of

The presence of halogen, in an organic compound, is detected by

On combustion, 0.2 g of an organic compound containing carbon, hydrogen and oxygen yields 0.147 g carbon dioxide and 0.12 g water. The percentage of carbon, hydrogen and oxygen respectively in the compound are