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

$1. {\mathrm{Na}}_4\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]$
$2. {\mathrm{Fe}}_4[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6{]}_3$
$3. {\mathrm{Fe}}_2\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]$
$4. {\mathrm{Fe}}_3[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6{]}_4$

The latest technique for isolation, purification and separation of organic compounds is -

${}_{}$
What type of reaction is represented by the following equation?

\(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{I}+\mathrm{KOH}(\mathrm{aq}) \rightarrow \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH}+\mathrm{KI} \)

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 -

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