Chemistry / Unit 6 Chem 1115 short lesson, about 20 seconds
A Double Bond as Sigma Plus Pi
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The idea
A double bond consists of exactly one sigma bond from hybrid-orbital overlap plus one pi bond from leftover unhybridized p-orbital overlap.
In practice
Ethylene's carbon-carbon double bond is one sp²-sp² sigma bond plus one pi bond from the remaining unhybridized p orbitals.
Where people slip
A double bond's second bond is always a pi bond, never a second sigma bond; two atoms share only one overlap axis.
Your place on the trail
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