When hybridisation involving d-orbitals are considered then all the five d-orbitals are not degenerate, rather dx2−y2, dz2 and dxy, dyz, dzx form two different sets of orbitals and orbitals of appropriate set is involved in the hybridisation.
Molecule having trigonal bipyramidal geometry and sp3d hybridisation, d-orbitals involved is:
a. dxy
b. dyz
c. dx2−y2
d. dz2