The kind of valency that exists in CaH2 and C2H2 is
Electrovalency in CaH2 and covalency in C2H2
Electrovalency in both
Covalency in CaH2 and electrovalency in C2H2
Covalency in both
Anthracene is purified by
Filtration
Crystallization
Distillation
Sublimation
Which of the following will have least hindered rotation about carbon-carbon bond?
Ethane
Ethylene
Acetylene
Hexachloroethane
When mixture of potassium cyanate and ammonium chloride is heated, it gives
Urea
Methanamide
Ethanamide
Ethanamine
If two compounds have the same empirical formula but different molecular formulae, they must have
Different percentage composition
Different molecular weights
Same viscosity
Same vapour density
Which of the following compounds does not show Lassaigne's test for nitrogen?
Hydrazine
Phenyl hydrazine
Azobenzene
The compound that does not give a blue colour in Lassaigne's test is
Aniline
Glycine
A gaseous hydrocarbon has 85% carbon and vapour density of 28. The possible formula of the hydrocarbon will be
C3H6
C2H4
C2H2
C4H8
Which of the following statement is wrong?
Using Lassaigne's test nitrogen or sulphur present in an organic compound can be tested.
Using Beilstein's test the presence of halogen in a compound can be tested.
Lassaigne's test fails to identify nitrogen in diazo compound.
In the estimation of carbon an organic compound is heated with CaO in a combustion tube.
Which of the following compounds will show metamerism?
CH3COOC2H5
C2H5 — S — C2H5
CH3 — O —CH3
CH3 — O —C2H5
