(Polar molecules, Non-polar molecules, etc.)
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Sigma bonds can rotate, however Pi bonds cannot rotate because there are two distinct sigma bonds there, therefore forming a pi bond. If you attempted to rotate the compound, then the Pi bond would therefore break. Sigma Bonds are formed when the electron density is at the center of the bond, and it bonds ends to end with two 2pz1 orbitals, whereas a pi bond forms with two neighboring 2p orbitals and it forms side to side, therefore the electron density is not located between the bonds.
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