I was reading that a higher bond order makes that bond shorter. That a double bond will be shorter than a single bond.
But why does the extra pair of electrons that is shared in C=C vs a C-C move the carbon molecules together.
Wouldn't the presence of more electrons in the same space produce a repulsion effect or does the nucleus of each atom try and move closer to the extra electron it gets due to a second bond that forms. It has to be to overcome the repulsion of the electrons.