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 will have least hindered rotation about carbon-carbon bond?
Ethane
Ethylene
Acetylene
Hexachloroethane
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
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
Sodalime test is used to detect the following element in an organic compound?
C
H
N
S
The most suitable method for separation of 1 : 1 mixture of ortho and para- nitro phenol is
Chromatography
Steam distillation
When mixture of potassium cyanate and ammonium chloride is heated, it gives
Urea
Methanamide
Ethanamide
Ethanamine
Which of the following compounds does not show Lassaigne's test for nitrogen?
Hydrazine
Phenyl hydrazine
Azobenzene
The Lassaigne's extract is boiled with dilute HNO3 before testing for halogens because
Ag2S is insoluble in HNO3
AgCN is soluble in HNO3
Na2S and NaCN are decomposed by HNO3
Silver halides are soluble in HNO3
