In the Kjeldahl's method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75 g of sample neutralised 10 mL of 1 M H₂SO₄. The percentage of nitrogen in the soil is

1. 37.33             2. 45.33

3. 35.33             4. 43.33

 

Which one among the following is most reactive towards nucleophilic addition reaction?

1.		2.
3.		4.

In Duma's method of estimation of nitrogen, 0.35 g of an organic compound gave 55 ml of nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the compound would be:

(Aqueous tension at 300 K = 15 mm)

1. 16.45

2. 27.45

3. 44.45

4. 35.45

The Lassaigne's extract is boiled with a concentration HNO₃ while testing for halogens. By doing so it:

1. Helps in the precipitation of AgCl.

2. Increases the solubility product of AgCl.

3. Increases the concentration of NO₃^- ions.

4. Decomposes Na₂S and NaCN, if formed.

which one of the following has the most acidic nature?

1.		2.
3.		4.

Among the given compounds, the most susceptible to nucleophilic attack at the carbonyl group is

1. CH₃COOCH₃

2. CH₃CONH₂

3. CH₃COOCOCH₃

4. CH₃COCl

How many stereoisomers does this molecule have?

CH₃CH=CHCH₂C HBrCH₃

1. 4

2. 6

3. 8

4. 2 

Maleic and fumaric acids are:

1. tautomers                 

2. geometrical isomers

3. chain isomers             

4. functional isomers

The maximum number of stereoisomers possible for 3-hydroxy-2-methyl butanoic acid is:

1. 1               2. 2

3. 3               4. 4

The isomeric cis-2-Butene and trans-2-Butene can be distinguished on the basis of:

1. Their colour.

2. Their reduction products.

3. The products they give on ozonolysis..

4. The products they give on addition to bromine.