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

The number of tertiary carbon atoms in tertiary butyl alcohol are-

 The structure of diphenylmethane is given below:

The number of  structural isomers possible when one of the hydrogen atom is replaced by a chlorine atom are :

Which one of the following is the stable structure of cyclohexatriene?

1. Chair form             

2. Boat form

3. Half chair form          

4. Planar form