0.1688 g organic compound when analyzed by the Dumas method yields 31.7 mL of moist nitrogen measured at 14º C and 758 mm mercury pressure. The % of the nitrogen in the organic compound (Aqueous tension at 14 º C =12 mm) is:

1. 30.9%

2. 10%

3. 40%

4. 21.9 %

Find the percentage of nitrogen in an organic compound from the following Kjeldahl’s method data:
0.6 g compound was Kjeldahlised. NH₃ evolved was absorbed in 50 mL of semi-normal H₂SO₄.
The remaining acid was diluted to 150 mL. 20 mL of this diluted solution required 35 mL of N/20 NaOH for neutralisation.

1. 24.2% 

2. 32.4%

3.27.6 %

4. 20.8%

Which of the following is responsible for the Prussian blue colour in Lassaigne’s test for nitrogen?:

$1.<mspace\; width="1em"></mspace>{\mathrm{Na}}_4\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]<mspace\; width="1em"></mspace>$
$2.<mspace\; width="1em"></mspace>{\mathrm{Fe}}_4[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6{]}_3$
$3.<mspace\; width="1em"></mspace>{\mathrm{Fe}}_2\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]<mspace\; width="1em"></mspace>$
$4.<mspace\; width="1em"></mspace>{\mathrm{Fe}}_3[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6{]}_4$

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

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 -