Question

When hybridisation involving $d$-orbitals is considered all the five $d$-orbitals are not degenerate, rather $d_{x^2-y^2},d_z^2$ and $d_{xy}$, $d_{yz}$, $d_{zx}$ form two different sets of orbitals and orbitals of appropriate set are involved in the hybridisation.

Molecule has trigonal bipyramidal geometry and $s{p}^{3}d$ hybridisation, $d$-orbitals involved is:

• A. $d_{xy}$
• B. $d_{yz}$
• C. $d_{x^2-y^2}$
• D. $d_{z^2}$

Answer 1

The correct option is D $d_{z^2}$

Molecule have trigonal bipyramidal geometry and $s{p}^{3}d$ hybridisation, d-orbitals involved are $d_{z^2}$. In $d_{z^2}$ orbiltal, the electron density is along z axis and there is no electron density in xy plane.