Geometric isomerism is typically observed in___________________?
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Answer: B. Alkenes
Explanation
Alkenes feature a rigid carbon-carbon double bond that prevents free rotation around the axis. Different groups attached to the double-bonded carbons create distinct spatial geometric arrangements. This restricted rotation is the fundamental structural requirement for observing cis-trans isomerism. Sigma bonds allow free rotation, whereas pi bonds lock atoms into fixed spatial orientations. The cis prefix indicates identical groups on the same side of the double bond. The trans prefix indicates identical groups located on opposite sides of the double bond.
Biological vision relies on the cis-trans photoisomerization of retinal molecules inside the eye. Fatty acid chemistry involves geometric isomers that significantly affect human cardiovascular health. Polymer chemists utilize stereospecific catalysts to control the geometric structure of synthesized plastics. Option A lists alkanes, which contain only single bonds and permit free rotation around them. Option C lists alkynes, whose linear geometry prevents the formation of cis-trans isomers. Option D lists esters, which undergo different types of structural and functional isomerism.
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