So this is our lumo, or lowest unoccupied molecular orbital. So when these two orbitals interact, so we have the SP three interacting with the one S, and we form the following two orbitals. We form the bonding molecular orbital and the anti bonding molecular orbital. Now, since this orbital is lower in energy, that means our electron pair coming from this highest occupied molecular orbital goes directly into this bonding molecular orbital. So let's look at a few more examples. Now, let's suppose we have example a.