An organic compound has an empirical formula (CH2O). Its vapour density is 45. The molecular formula of the compound is

Mol. wt. =2× vapour density =2×45=90Empirical formula weight = 12 + 2 +16 = 30n= mol. wt.  empirical formula wt. =9030=3∴ Molecular formula of the compound =CH2O3=C3H6O3