Sigma/pi bonds

[MedhaVallurupalli1F]

Which bond allows for rotation around the molecule, sigma or pi?

[Chem_Mod]

Sigma bonds can rotate. Pi bonds can not rotate because they arise from the unhybridized p orbitals, and because of their shape they must be in the same orientation, thus restricting a rotational ability or else the bond will be broken.

[Haorui Li 1A]

Can Pi bonds be considered just a force of attraction between electron pairs?

[Chem_Mod]

No, electrons do not attract each other as they are the same charge. Pi bonds occur when electrons are shared through side-by-side orbital overlap rather than by end-to-end orbital overlap, which results in sigma bonding instead.