Orbital overlap: Sigma and Pi Bonding When two atoms form a single covalent bond

Question

Orbital overlap: Sigma and Pi Bonding When two atoms form a single covalent bond, two orbitals (one from each atom) overlap such that the electron pair can be in both orbitals simultaneously. Double and triple bonds involve the sharing of multiple electron pairs. Each additional electron pair requires the overlap of another set of orbitals. A set of overlapping orbitals is called a o bond (sigma bond) if the overlap is head-on and a r bond (pi bond) if the overlap is sideways. Figure 1 of 1 H cumulene

Explanation / Answer

In cumulene the bond angle between C=C=C is 180 oC

and the bond angle between H-C-H is 120 oC.

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