Question:
Which of the following alkenes does NOT exhibit cis-trans isomerism?
Which of the following alkenes does NOT exhibit cis-trans isomerism?
Show Hint
Terminal alkenes (like 1-alkenes) generally do not show geometrical isomerism because the end carbon has two hydrogens.
Updated On: Apr 26, 2026
- But-1-ene
- But-2-ene
- 3,4-Dimethylhex-3-ene
- Pent-2-ene
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The Correct Option is A
Solution and Explanation
Step 1: Concept
For cis-trans (geometrical) isomerism, each carbon of the double bond must be attached to two different groups.
Step 2: Analysis of But-1-ene
The structure is $\text{CH}_2 = \text{CH}-\text{CH}_2-\text{CH}_3$. - The first carbon ($\text{C}_1$) is attached to two identical Hydrogen atoms ($-\text{H}$ and $-\text{H}$).
Step 3: Conclusion
Because one of the doubly bonded carbons has two identical groups, rotation or swapping does not create a new spatial arrangement. Therefore, it cannot show cis-trans isomerism.
Final Answer: (A)
For cis-trans (geometrical) isomerism, each carbon of the double bond must be attached to two different groups.
Step 2: Analysis of But-1-ene
The structure is $\text{CH}_2 = \text{CH}-\text{CH}_2-\text{CH}_3$. - The first carbon ($\text{C}_1$) is attached to two identical Hydrogen atoms ($-\text{H}$ and $-\text{H}$).
Step 3: Conclusion
Because one of the doubly bonded carbons has two identical groups, rotation or swapping does not create a new spatial arrangement. Therefore, it cannot show cis-trans isomerism.
Final Answer: (A)
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