Question

Which among the following orbitals form Delta ($\delta$) molecular orbitals?

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

Hint:

$\delta$ bonds are rare and are mainly formed by sidewise overlap of d-orbitals with four lobes.

Answer 1

The Correct Option is D

Step 1: Understanding delta molecular orbitals.
Delta ($\delta$) molecular orbitals are formed by the sidewise overlap of orbitals having four lobes lying in the plane perpendicular to the internuclear axis.

Step 2: Nature of d-orbitals.
The $d_{xy}$ and $d_{x^2-y^2}$ orbitals possess four lobes oriented between or along the axes, making them suitable for $\delta$ overlap.

Step 3: Elimination of other options.
Orbitals like $d_{z^2}$ and $d_{yz}$ are involved in $\sigma$ or $\pi$ bonding, not $\delta$ bonding.

Step 4: Conclusion.
Hence, $\delta$ molecular orbitals are formed by the overlap of $d_{xy$ and $d_{x^2-y^2}$ orbitals}.