Question

Which is not true about VSEPR theory?

• A. Lone pair-lone pair repulsion is maximum
• B. Lone pair and double bond occupy the axial position in trigonal bipyramidal structure.
• C. More electronegative atoms occupies the axial position in trigonal bipyramidal structure.
• D. Bigger atoms occupy equitorial positions in trigonal bipyramidal structure.

Answer 1

The correct option is B Lone pair and double bond occupy the axial position in trigonal bipyramidal structure.

According to Bent's rule, the most electronegative element occupies the hybrid orbital having a less percentage s-character or we can say that the most electronegative element occupies the axial postion.

Large atoms, lone pairs and double bonds occupy the equitorial positions in a trigonal bipyramidal structure to minimize repulsions.

Lone pair-lone pair repulsions are always higher than lone pair-bond pair repulsions and bond pair-bond pair repulsions.