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Sigma bonds have their electron density along the bond axis, while pi bonds have their electron density above and below the bond axis. Therefore, the pi bonds cannot rotate like the sigma bonds because rotating would break the pi bond.
Pi bonds consist of orbitals that are aligned side-by-side, in which one of the two orbitals cannot align in a different position to make the bond. Sigma bonds consist of orbitals that are aligned end-to-end, which allow them to rotate.
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