Which of the following has an asymmetric carbon atom?

1. 

2. 

3. 

4. 

Stereoisomers (geometrical or optical) that are neither superimposable nor a mirror images to each other are called:

1. Enantiomers             

2. Monomers

3. Tautomers               

4. Diastereomers

Diastereomers can be separated by:

1. Recrystallization            

2. simple distillation

3. electrophoresis                     

4. all of these

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