Pi and sigma bonds [ENDORSED]

[CalebBurns3L]

Is the only difference between Pi and Sigma bonds that Pi bonds can rotate?

[Nehal Banik]

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.

[Manasvi Paudel 1A]

I think the most important thing to know about pi and sigma bonds is that a single bond is a sigma bond and a double bond is a sigma and a pi bond. Pi bonds don't allow rotation.

[diangelosoriano]

Can anyone explain how pi and sigma bonds change with resonance structures?

[Gurpreet Khamba 1J]

Pi and Sigma bonds don't change with resonance structures. As you create the lewis structures, you understand that the representations do not accurately represent the molecule.

[PranithaPrasad]

If there's resonance, do the sigma and pi bonds become delocalized?

[Chem_Mod]

Resonance delocalizes pi, but not sigma bonds.

[Alex Nechaev 1I]

If there's a resonance structure, the pi bonds will be delocalized. Sigma bonds don't become delocalized, so resonance has no effect on them.