Which of the following method is used to estimate nitrogen in the laboratory ?

What is the molecular formula of a compound, if its empirical formula is C₄H₄O and its molecular weight is 136?

An alkane has a C/H ratio (by mass) of 5.1428. Its molecular formula is

An organic compound containing C, H and N gave the following analysis: C = 40%, H = 13.33% and N = 46.67%. The empirical formula of the compound would be

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

The latest technique for the purification of organic compounds is

In an experiment, 0.236 g of an organic compound gave on combustion 0.352 g of carbon dioxide and 0.108 g of water. The simplest formula of the compound is

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

An organic compound is found to contain C = 54.5%, O = 36.4% and H = 9.1%. Its empirical formula is