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

1. Chair form             

2. Boat form

3. Half chair form          

4. Planar form

Meso tartaric acid is optically inactive due to the presence of:

1. molecular symmetry

2. molecular asymmetry

3. external compensation

4. two asymmetric carbon atoms

​ . Where X and Y are

1. Positional isomers             

2. Functional isomers

3. Metamers                   

4. Tautomers

The property by virtue of which a compound can turn the plane of polarization of light is known as:

1. Photolysis              

2. Phosphorescence

3. Optical activity           

4. Polarization

The molecular formula of a saturated compound is C₂H₄Br₂. This formula permits the existence of:

1. Functional isomers       

2. Optical isomers

3. Positional isomers        

4. Cis-trans isomers

Which of the following may exist as enantiomers?

1.
2.	\(\mathrm{CH}_2=\mathrm{CHCH}_2 \mathrm{CH}_2 \mathrm{CH}_3 \)
3.
4.

The total number of isomers could be obtained from the alkane, C₆H₁₄ is-

1. Four                   

2. Five

3. Six                    

4. Seven

CH₃-CHCl-CH₂-CH₃ has a chiral center. Which one of the following represents its R-configuration? 

1.

2. 

3. 

4. 

The number of primary carbon atoms in the following compound are:

4-methylpent-2-ene is  achiral because it has:

1. a centre of symmetry 

2. a plane of symmetry 

3. symmetry at C 4 carbon

4. both centre and a plane of symmetry