AP Chemistrymediummcq1 pt
In ethene (C₂H₄), what is the carbon-carbon double bond composed of?
A.One sigma bond plus one pi bond
B.Two sigma bonds
C.Two pi bonds
D.One delocalized three-center bond
Explanation
Core Concept
Each ethene carbon has three electron domains, so it uses sp² hybrids arranged trigonal planar. Head-on overlap of one sp² hybrid from each carbon forms the sigma component along the C-C axis. Each carbon also keeps one unhybridized p orbital, and these overlap side-by-side above and below the axis to add a single pi bond. Every double bond combines exactly one sigma and one pi interaction.
Correct Answer
AOne sigma bond plus one pi bond
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