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]3
3. 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 |
 65%
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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, Sulphur

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 sulphide

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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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.
Subtopic:  Quantitative Analysis of Organic Compounds |
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