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Solution


Q.

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]
1 (B) and (C) only  
2 (C), (D) and (E) only  
3 (A) and (E) only  
4 (A), (D) and (E) only  

Ans.

(4)

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