Which of the following pairs of carbon skeletons is an example of isomerism?

1. 

2. 

3. 

4. 

The number of isomeric structures for C₂H₇N would be:

1. 4 

2. 3

3. 2 

4. 1

Number of isomers possible for C₄H₈ are-

1. 4     

2. 3       

3. 2     

4. 6

The dihedral angle between the hydrogen atoms of two methyl groups in staggered conformation of ethane is:

1. 120° 

2. 180°

3. 90° 

4. 60°

Which of the following acid does not exhibit optical isomerism?

1. Maleic acid                           
2. $\mathrm{\alpha }$-amino acid

3. Lactic acid                             
4. Tartaric acid                             

The prefix used for -SH group as per the IUPAC system is-

1. Mercapto

2. Thiol

3. Sulfide

4. None of the above

The chirality of the compound                           

1. R 

2.  S

3. Z 

4. E

The angle of rotation of the plane of polarized light depends upon:

1. the nature of the light beam

2. the number of the molecules

3. the number of asymmetric carbon atoms in the molecule of the substance

4. All of the above

The process of separation of racemic mixture into d- and l-enantiomers is called:

1. revolution

2. resolution 

3. hydration 

4. dehydration             

The molecule that exhibits chirality is:         

1. 2-methyl hexane

2. 3-methyl hexane

3. Neopentane

4. Isopentane