If two different non-axial d-orbitals having 'xz' nodal plane form `pi`-bond by overlapping each other, then internuclear axis will be :

Options

A. x
B. y
C. z
D. They don't form `pi`-bond

Explanation

To solve the problem, we need to analyze the situation involving two different non-axial d-orbitals that have an xz nodal plane and determine what the internuclear axis will be when they attempt to form a pi bond.

### Step-by-step Solution:

1. **Identify Non-Axial d-Orbitals**:
The non-axial d-orbitals among the five d-orbitals are \(d_{xy}\), \(d_{yz}\), and \(d_{zx}\). The axial d-orbitals are \(d_{x^2-y^2}\) and \(d_{z^2}\).

**Hint**: Remember that non-axial orbitals do not align along the x, y, or z axes.

2. **Determine the Nodal Plane**:
The problem specifies that the d-orbitals have an xz nodal plane. This means that the electron density is absent in the xz plane. The orbitals that can have an xz nodal plane are \(d_{xy}\) and \(d_{yz}\).

**Hint**: A nodal plane is where there is no electron density; visualize how the orbitals are oriented in space.

3. **Visualize the Orbitals**:
- The \(d_{xy}\) orbital has lobes in the xy-plane.
- The \(d_{yz}\) orbital has lobes in the yz-plane.
When visualizing these orbitals, you can see that they are oriented perpendicularly to each other.

**Hint**: Sketching the orbitals can help you understand their spatial arrangement.

4. **Analyze the Overlap for Pi Bonding**:
For two orbitals to form a pi bond, they must overlap in the same plane. Since \(d_{xy}\) and \(d_{yz}\) are perpendicular to each other, they cannot overlap effectively to form a pi bond.

**Hint**: Recall that pi bonds require parallel overlap of orbitals.

5. **Conclusion**:
Since no pi bond can form between the \(d_{xy}\) and \(d_{yz}\) orbitals due to their perpendicular orientation, there will be no internuclear axis defined for a pi bond.

**Final Answer**: The internuclear axis will be that they do not form a pi bond.

### Summary:
The correct answer is that the two non-axial d-orbitals do not form a pi bond, and therefore, there is no internuclear axis defined. This leads us to conclude that option D (they do not form pi bonds) is the correct answer.