2 g of an organic nitrogen-containing compound, on heating, decomposes to give 0.4 g of nitrogen. What should be nature of the compound?

N-containing compound →heatN20.4g 0.4 g of N2 is obtained from 2 g of compound. 28 g N2 is obtained from 20.4 × 28=140Hence molecular weight of the compound is coincides withC6H5N2Cl72+5+28+35.5 = 140.5.