Sigma and Pi bonds

[Melissa Villanueva1K]

Which are stronger, sigma or pi bonds, and why?

[sarahtang4B]

Pi bonds are usually weaker than sigma bonds. Quantum mechanics says this is because the orbital paths are parallel so there is much less overlap between the p-orbitals. Pi bonds happen when two atomic orbitals are in contact through two areas of overlap.

[Kathryn Wilhem 1I]

Pi bonds do not allow atoms to rotate as well. If the atoms rotate, the pi bonds will easily break. However, sigma bonds do allow the atoms to rotate.