In the Lassaigne’s test for nitrogen in an organic compound, the Prussian blue colour is obtained due to the formation of-

1. Na4[Fe(CN)6] 2. Fe4[Fe(CN)6]33. Fe2[Fe(CN)6] 4. Fe3[Fe(CN)6]4

Subtopic:  Qualitative Analysis of Organic Compounds |
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The latest technique for isolation, purification and separation of organic compounds is -

1. Crystallisation

2. Distillation

3. Sublimation

4. Chromatography

Subtopic:  Purification of Organic Compounds |
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CH3CH2I + KOH(aq)  CH3CH2OH + KI

The above reaction is an example of -

1. Nucleophilic substitution reaction

2. Elimination reaction

3. Addition reaction

4. Electrophilic substitution reaction

 

Subtopic:  Types of Reaction |
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IUPAC name of the given compound is

1. 3-Phenylpropane

2. Phenyl-1-butane

3. 2-Benzylethane

4. Propyl benzene

Subtopic:  Nomenclature |
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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 

Subtopic:  Purification of Organic Compounds |
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Method that can be used to purify the liquid that decomposes on boiling is

1) Fractional distillation

2) Distillation under reduced pressure

3) Steam distillation

4) Distillation

Subtopic:  Purification of Organic Compounds |
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Lassaigne's test can detect -

1. Nitrogen, Sulphur, Halogens

2. Nitrogen, Cyanides, Suphur

3. Sodium, Sulphur, Halogens, Phosphorus

4. Nitrogen, Sulphur, Halogens, Phosphorus

Subtopic:  Qualitative Analysis of Organic Compounds |
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Halogen in an organic compound that can be detected by -

1. Duma's method

2. Carius method

3. Kjedahl's method

4. Chromatography

Subtopic:  Purification of Organic Compounds |
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Nitric acid is added to sodium extract before adding silver nitrate for testing halogens because

1. Nitric acid reduces suphide

2. Nitric acid decomposes NaCN and Na2S

3. Nitric acid oxidises the organic compound

4. Nitric acid acts as a dehydrating agent

Subtopic:  Qualitative Analysis of Organic Compounds |
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The reason why we fuse an organic compound with metallic sodium for testing nitrogen, sulphur, and halogens 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

Subtopic:  Quantitative Analysis of Organic Compounds |
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