What is the molecular formula of a compound, if its empirical formula is CH2O and its molecular weight is 90?
C2H6O2
C6H6O3
C3H6O3
C4H8O4
What is the molecular formula of a compound, if its empirical formula is C4H4O and its molecular weight is 136?
C4H4O
C4H4O8
C8H8O
C8H8O2
Empirical formula of a compound is CH2Br. If its vapour density is 93.5, then the molecular formula of the compound is
CH4Br2
C2H4Br
C4H2Br2
C2H4Br2
The compound formed in the positive test for nitrogen with the Lassaigne’s solution of an organic compound is
Fe(CN)3
Na3[(CN)6]
Fe4[(CN)6]3
Na4[Fe(CN)5NOS]
Distillation, under reduced pressure, is employed for
C6H6
Petrol
CH2OH CHOH CH2OH
Organic compounds used as medicines.
In an experiment, 0.1877g of an organic compound when analyzed by the Dumas method yielded 31.7 ml of moist nitrogen measured at 140C and 758 mm mercury pressure. The percentage of nitrogen in the compound is (Aqueous tension at 140C = 12 mm)
19.7
22.3
24.3
25.6
The most suitable method for the separation of a 1:1 mixture of ortho- and para- nitrophenols is
Filtration
Sublimation
Crystallisation
Steam distillation
When 0.759 g of the silver salt of dibasic organic acid was ignited, then a residue of 0.463 g of metallic silver was left. Molecular weight of the acid is
32
56
92
140
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
CH3O
CH2O
C2H3O2
C2H2O2
An alkane has a C/H ratio (by mass) of 5.1428. Its molecular formula is
C5H12
C6H14
C8H18
C7H10