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 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. Choose the correct answer from the options given below :
A) (A) and (E) Only
B) (A), (D) and (E) Only
C) (B) and (C) Only
D) (C), (D) and (E) Only
Explanation
[Solution by Dr. Abubacker] Propene (A) and 2-methylbut-2-ene (D) each have two identical groups on one alkene carbon, so neither shows cis-trans isomerism. Trans isomers generally pack better and have higher melting points than cis, so (E) is incorrect. (B) and (C) are correct statements. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.