Which of the following compounds will exhibit cis-trans isomerism?
Correct answer: A. 2-butene
- A. 2-butene
- B. 2-butyne
- C. 2-butanol
- D. butanal
Explanation
2-butene is the only compound among the options that has a carbon-carbon double bond, which allows for restricted rotation, giving rise to cis-trans isomers. In cis-trans isomerism, the substituents of the double bond can be arranged in different spatial orientations, leading to distinct isomers. The 'cis' isomer has substituents on the same side, while the 'trans' isomer has them on opposite sides. Other compounds like 2-butyne have a triple bond, making them linear and incapable of exhibiting cis-trans isomerism. 2-butanol and butanal lack the necessary double bond between carbon atoms for this type of isomerism.
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Organic chemistry begins with carbon compounds classified by carbon skeleton, saturation and functional group. Work includes identifying groups such as hydroxyl, carbonyl, carboxyl and amino, applying basic nomenclature, and distinguishing structural, geometric and optical isomers, where the same molecular formula does not necessarily mean the same structure or properties.
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