(Polar molecules, Non-polar molecules, etc.)
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it depends on whether the molecule has resonance structures or not. If the pi bond is in a molecule that has resonance, then it is delocalized. If it is in a molecule that does NOT have resonance such that the pi bond is between only two atoms, then it is localized. Hope this Helps!
Essentially if it doesn't matter which atom specifically needs the double bond in the lewis structure, then there is delocalization. For example, benzene, a 6 Carbon ring with three double bonds has delocalized pi bonds because there it doesn't matter which 3 Carbons are double bonded together, so long as they are alternating between single bond and double bond.
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