Explanation:

In square planar complexes, the metal ion is surrounded by four ligands in a square plane. The d-orbitals of the metal ion are involved in the formation of hybrid orbitals with the ligand orbitals to form the bonding and non-bonding molecular orbitals.

Which d-orbitals get direct interaction with ligand orbitals?

The d-orbitals that get direct interaction with ligand orbitals in square planar complexes are:

dx2-y2 orbital:

The dx2-y2 orbital is located along the x and y axes and has two lobes that point towards the x and y axes. It is oriented along the square plane and interacts directly with the ligand orbitals.

This orbital is involved in the formation of the σ bond between the metal ion and the ligands.

dxy orbital:

The dxy orbital is located in the xy plane and has lobes that point towards the x and y axes. It is oriented perpendicular to the square plane and does not interact directly with the ligand orbitals.

dyz and dxz orbitals:

The dyz and dxz orbitals are located along the y and x axes, respectively, and have lobes that point towards the z axis. They are oriented perpendicular to the square plane and do not interact directly with the ligand orbitals.

dz2 orbital:

The dz2 orbital is located along the z axis and has two lobes that point towards the z axis. It interacts indirectly with the ligand orbitals through the dx2-y2 orbital.

Conclusion:

In square planar complexes, the dx2-y2 orbital gets direct interaction with the ligand orbitals, while the dxy, dyz, dxz, and dz2 orbitals do not.