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Topic Question Set

Q 1 :

Which one of the following will show geometrical isomerism?                         [2024]

  •  

  •  

  •  

  •  

(4)

For geometrical isomerism in alkenes, double bond should be unsymmetrically substituted at both ends. Therefore, compound in (4) shows geometrical isomerism.

 

Q 2 :

The incorrect statement regarding the geometrical isomers of 2-butene is:                             [2024]

  • trans-2-butene is more stable than cis-2-butene.

     

  • cis-2-butene has less dipole moment than trans-2-butene.

     

  • cis-2-butene and trans-2-butene are not interconvertible at room temperature.

     

  • cis-2-butene and trans-2-butene are stereoisomers.

     

(2)

(1) Due to repulsion between more bulky methyl groups, cis-but-2-ene is less stable than trans but-2-ene.

(2) 

      Bond moments in trans but-2-ene cancel out to give zero net dipole moment.

(3) Free rotation around C = C is not possible at room temperature, hence cis-but-2-ene and trans-but-2-ene are not interconvertible at room temperature.

 

Q 3 :

Number of geometrical isomers possible for the given structure is/are _____.                         [2024]



(4)

Given compound has four geometrical isomers as shown below:

 

Q 4 :

2-chlorobutane + Cl2→C4H8Cl2 (isomers)
Total number of optically active isomers shown by C4H8Cl2, obtained in the above reaction is _____.                [2024]



(6)

Q 5 :

The incorrect statements regarding geometrical isomerism are:
(A) Propene shows geometrical isomerism.
(B) Trans isomer has identical atoms/groups on the opposite sides of double bond.
(C) Cis-but-2-ene has higher dipole moment than trans-but-2-ene.
(D) 2-methylbut-2-ene shows two geometrical isomers.
(E) Trans-isomer has lower melting points than cis isomer.

Choose the correct answer from the options given below:                              [2025]

  • (B) and (C) only

     

  • (C), (D) and (E) only

     

  • (A) and (E) only

     

  • (A), (D) and (E) only

     

(4)

(E)  Trans isomer is more tightly packed in solid state due to more symmetry, hence trans isomer has higher melting point.

 

Q 6 :

Given below are two statements:                          [2025]

In the light of the above statements, choose the most appropriate answer from the options given below:

  • Statement I is correct but statement II is incorrect.

     

  • Statement I is incorrect but statement II is correct.

     

  • Both statement I and statement II are incorrect.

     

  • Both statement I and statement II are correct.

     

(1)