Which of the following will not show cis-trans-isomerism?                           

  • CH3-CH=CH-CH3

  • CH3-CH2-CH=CH-CH2-CH3

  •  CH3-C|=CH-CH2-CH3           CH3

  • CH3-C|H-CH=CH-CH2-CH3           CH3          

An alkane can form Structural isomers if the number of carbon atoms is-

  •  ≥1                                 

  •  ≥2

  •  ≥3                                   

  •  ≥4

Isomerism exhibited by acetic acid and methyl formate is:

  • Functional                         

  • Chain

  • Geometrical                       

  • Central 

Which one of the following pairs represents stereoisomerism?                                     

  • Chain isomerism and rotational isomerism

  • Structural isomerism and geometrical isomerism

  • Linkage isomerism and geometrical isomerism

  • Optical isomerism and geometrical isomerism

α-D-glucose and β-D glucose have a specific rotation of +112° and +19° respectively. In aqueous solution the rotation becomes +52°. This process is called:

  • inversion                 

  • racemisation

  • mutarotation             

  • embolism

A racemic mixture is formed by mixing two:

  • Isomeric compounds             

  • Chiral compounds

  • Meso compounds                       

  • Enantiomers

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

  • 2,3-dimethyl pentane 

  • 2,2-dimethyl butane 

  • 2-methyl hexane 

  • None of the above

Which of the following has an asymmetric carbon atom?

  •  

  •  

  •  

  •  

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

  • Enantiomers             

  • Monomers

  • Tautomers               

  • Diastereomers

Diastereomers can be separated by:

  • Recrystallization            

  • simple distillation

  • electrophoresis                     

  • all of these

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

  •  

  •  

  •  

  •  

The number of isomeric structures for C2H7N would be:

  • 4 

  • 3

  • 2 

  • 1

Number of isomers possible for C4H8 are-

  • 4     

  • 3       

  • 2     

  • 6

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

  • 120° 

  • 180°

  • 90° 

  • 60°

Which of the following acid does not exhibit optical isomerism?

  • Maleic acid                             2. α-amino acid

  • 2

  • Lactic acid                              4. Tartaric acid                             

  • 4

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

  • Mercapto

  • Thiol

  • Sulfide

  • None of the above

The chirality of the compound                           

  •  R 

  •   S

  •  Z 

  •  E

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

  • the nature of the light beam

  • the number of the molecules

  • the number of asymmetric carbon atoms in the molecule of the substance

  • All of the above

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

  • revolution

  • resolution 

  • hydration 

  • dehydration             

Which of the following will exhibit chirality?             

  • 2-methyl hexane

  • 3-methyl hexane

  • Neopentane

  • Isopentane

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

  • 2

  • 1                 

  • Zero               

  • 4

 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 :

  • 6       

  • 4       

  • 8       

  • 7

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

  • Chair form             

  • Boat form

  • Half chair form          

  • Planar form

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

  • molecular symmetry

  • molecular asymmetry

  • external compensation

  • two asymmetric carbon atoms

​ . Where X and Y are

 

  • Positional isomers             

  • Functional isomers

  • Metamers                   

  • Tautomers

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

  • Photolysis              

  • Phosphorescence

  • Optical activity           

  • Polarization

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

  • Functional isomers       

  • Optical isomers

  • Positional isomers        

  • Cis-trans isomers

Which of the following may exist in enantiomorphs?

  •                    

  • CH2=CHCH2CH2CH3 

  •                   

  •  

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

  • Four                   

  • Five

  • Six                    

  • Seven

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

  •  

  •  

  •  

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