JAMB Chemistry 2025 Objective — Question 26

Question 26 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2025 Objective paper, with the correct answer and a full explanation.

Which of the following can exhibit cis-isomerism?

A. CH₂=CH₂
B. CH₃CH=CHCH₃Correct
C. CH₃C≡CCH₃
D. C₆H₆

Explanation

Cis-trans isomerism requires restricted rotation (double bond) and two different groups on each carbon of the double bond. But-2-ene (CH₃CH=CHCH₃) satisfies both conditions.

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