A sigma bond is formed by
- A. sideways overlap of two p orbitals
- B. head on overlap of two orbitals along the axis joining the nuclei
- C. the transfer of electrons from one atom to another
- D. attraction between two ions
Explanation
End on overlap concentrates electron density directly between the nuclei, which makes a sigma bond stronger than a pi bond and allows free rotation about it. Sideways overlap of parallel p orbitals gives a pi bond, with density above and below the internuclear axis. Every single bond is a sigma bond, and every multiple bond contains exactly one.
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