(Polar molecules, Non-polar molecules, etc.)
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The method through which they are bonded in the s or p suborbitals gives this characteristic. When we look at a sigma bond, we see that it does not have to be fixed in place as it is to the side of the atom, while the pi bonds are above and below a atom and therefore cannot move or they will break. If you remember the manner through which Doctor Lavelle explained this using the pencils and his hands, I believe this helped me understand this the most.
The main reason is because sigma bonds are formed when orbitals overlap end-to-end and pi bonds are formed when orbitals overlap side- by -side. This therefore, makes it difficult for pi bonds to rotate since they would break if rotated.
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