Which outcome occurs when a pi bond forms between two carbon atoms in a molecule?

💡 Explanation

When a pi bond forms, it constrains the geometry of the molecule and the p-orbitals align side-by-side above and below the sigma bond because this p-orbital overlap forces planarity upon the carbon atoms involved. Therefore geometric planarity is the result, rather than free rotation, weakened bond, or enhanced nucleophilic reactivity which each depend on differing molecular configurations.

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