Which one of the following pairs represents stereoisomerism?                                     

1. Chain isomerism and rotational isomerism

2. Structural isomerism and geometrical isomerism

3. Linkage isomerism and geometrical isomerism

4. Optical isomerism and geometrical isomerism

A racemic mixture is formed by mixing two:

1. Isomeric compounds             

2. Chiral compounds

3. Meso compounds                       

4. Enantiomers

A compound of molecular formula C₇H₁₆ shows optical isomerism, the compound will be

1. 2,3-dimethyl pentane 

2. 2,2-dimethyl butane 

3. 2-methyl hexane 

4. None of the above

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

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

1. 

2. 

3. 

4. 

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