(Polar molecules, Non-polar molecules, etc.)
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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, pi bonds cannot rotate the same way as sigma bonds since rotation would break the pi bond interaction.
The condition for double bonds is to be stable and rigid. A combination of a pi and sigma bond (forms a double bond) has restrictions on how the bond can rotate. If this bond rotates past its range of motion, the double bond would break.
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