Question

The incorrect statements regarding geometrical isomerism are: 
(A) Propene shows geometrical isomerism. 
(B) Trans isomer has identical atoms/groups on the opposite sides of the 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 point than cis isomer. 
 

• A. (A), (D) and (E) only
• B. (C), (D) and (E) only
• C. (B) and (C) only
• D. (A) and (E) only

Hint:

For geometrical isomerism to occur, different groups must be attached to the carbon atoms involved in the double bond.

Answer 1

The Correct Option is A

(A) Propene does not show geometrical isomerism because it has no substituents on both sides of the double bond. 
(B) Trans isomer has identical atoms/groups on opposite sides of the double bond. 
(C) Cis-but-2-ene has a higher dipole moment due to the presence of polar groups on the same side, unlike the trans isomer. 
(D) 2-methylbut-2-ene does not show geometrical isomerism because it does not have different groups on either side of the double bond. 
(E) Trans-isomer generally has a lower melting point due to its more symmetrical and compact structure compared to the cis-isomer. 

Thus, the correct answer is (A), (D) and (E) only.