Question

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Why pie bond form with sigma bond?

Why pie bond doesn't exists alone..

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Answer 1

Answer:

A π bond has a plane of symmetry along the bond axis. It cannot be formed by s-orbitals; it needs at least p-orbitals to be created. 90% of all bonds described some time or another are somehow involving carbon, nitrogen or oxygen. (In fact, I probably underestimated). But these elements can only use p-orbitals to create π bonds. To do that, one needs a p-orbital that is ortohogonal to the bond axis. So you run into the problem that you have an orbital pointing in one direction, but want to bond into another direction — hardly optimal, especially since there likely is already another orbital pointing in the direction you need to give a σ bond.

Transition metals can use d-orbitals for π bonding. They can actually point towards the atom they want to bond with so there is a greater chance of using them due to higher overlap. However, there will usually also be a different orbital pointing directly in the bonding direction which again will bond earlier and would give a σ bond.

Answer 2

$\huge\underline\mathfrak\purple{Answer}$

The reason is that π bond cannot be formed by s-orbitals.

It needs at least one p-orbitals to be created.

So it cannot exist independently.

Thank you! ❤