In the Lassaigne’s test for nitrogen in an organic compound, the Prussian blue colour is obtained due to the formation of:
The latest technique for isolation, purification and separation of organic compounds is -
| 1. | Crystallisation | 2. | Distillation |
| 3. | Sublimation | 4. | Chromatography |
1. Nucleophilic substitution reaction
2. Elimination reaction
3. Addition reaction
4. Electrophilic substitution reaction
IUPAC name of the given compound is :
1. 3-Phenylpropane
2. Phenyl-1-butane
3. 2-Benzylethane
4. Propyl benzene
The method that can be used to separate two compounds with different solubilities in a solvent is-
1. Distillation
2. Isolation
3. Fractional crystallization
4. Filtration
Which purification method is suitable for a liquid that decomposes upon boiling?
1. Fractional distillation
2. Steam distillation
3. Simple distillation
4. Distillation under reduced pressure
Lassaigne's test can detect:
1. Nitrogen, Sulphur, Halogens
2. Nitrogen, Cyanides, Sulphur
3. Sodium, Sulphur, Halogens, Phosphorus
4. Nitrogen, Sulphur, Halogens, Phosphorus
Halogen in an organic compound that can be detected by -
| 1. | Duma's method | 2. | Carius method |
| 3. | Kjeldahl's method | 4. | Chromatography |
Nitric acid is added to sodium extract before adding silver nitrate for testing halogens because:
1. Nitric acid reduces sulphide
2. Nitric acid decomposes NaCN and Na2S
3. Nitric acid oxidises the organic compound
4. Nitric acid acts as a dehydrating agent
Metallic sodium is fused with organic compounds for testing nitrogen, sulphur, and halogens. The correct reason behind this is:
| 1. | To convert all compounds to their ionic form. |
| 2. | Sodium reduces the compounds. |
| 3. | Sodium converts all compounds in their covalent form. |
| 4. | None of the above. |
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