The compound that does not give a blue colour in Lassaigne's test is
Aniline
Glycine
Hydrazine
Urea
Which of the following will have least hindered rotation about carbon-carbon bond?
Ethane
Ethylene
Acetylene
Hexachloroethane
Which of the following compounds will show metamerism?
CH3COOC2H5
C2H5 — S — C2H5
CH3 — O —CH3
CH3 — O —C2H5
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 does not show Lassaigne's test for nitrogen?
Phenyl hydrazine
Azobenzene
When mixture of potassium cyanate and ammonium chloride is heated, it gives
Methanamide
Ethanamide
Ethanamine
Sodalime test is used to detect the following element in an organic compound?
C
H
N
S
A gaseous hydrocarbon has 85% carbon and vapour density of 28. The possible formula of the hydrocarbon will be
C3H6
C2H4
C2H2
C4H8
Anthracene is purified by
Filtration
Crystallization
Distillation
Sublimation
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
