Allene with pi orbitals

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Human molecular orbital structure exhibits a key characteristic known as Allene resonance with intertwined sigma and pi bonds connecting each carbon atom within the double bond of an alkyne or enyne compound to a sp3 hybridized carbon bonded through a single bond, all resulting in delocalized electrons forming fused pi orbitals which is one possible Lewis electron-pair structures that account for stability when describing molecular shapes with such electronic arrangements.