Which of the following compounds exhibits geometric (cis-trans or E/Z) isomerism due to restricted bond rotation?
Answer and explanation
Correct answer: C. But-2-ene
- Step 1: Recall criteria for geometric isomerism in alkenes: Restricted rotation around a double bond and two different substituents on each double-bonded carbon.
- Step 2: Examine But-2-ene: CH3-CH=CH-CH3. Each double-bonded carbon has a -H and a -CH3, allowing cis-but-2-ene and trans-but-2-ene.
- Step 3: Check other options: But-1-ene and Propene have two identical hydrogens on terminal carbon C1; Ethane has single C-C bond with free rotation.
Answer
But-2-ene.
Why not the others: 'But-1-ene' has two hydrogen atoms on carbon-1 preventing cis-trans isomers; 'Ethane' contains only single bonds allowing free internal rotation; 'Propene' has two identical hydrogens on carbon-1.
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