Why can't lonepairs come on axial bonds first in molecular geometry?

Answer 1

In molecular geometry, lone pairs typically occupy equatorial positions rather than axial positions due to minimizing electron pair repulsion, as predicted by VSEPR theory. Placing lone pairs axially would result in 90-degree angles between neighboring bonds, increasing Hendrickson strain. In contrast, equatorial placement yields 120-degree angles, reducing strain and stabilizing the structure.