Which of the following overlaps is incorrect (assuming Z-axis is internucler axis ) ?
`(A) 2P_(y)+2p_(y) to pi`- Bond formation `" " (B) 2p_(x)+2p_(x)to sigma`- Bond formation
(C ) `33d_(xy)+3dp_(xy) to pi`- Bond formation `" " (D) 2s+2p_(y) to pi `- Bond formation
(E ) `3d_(xy)+3d_(xy)to delta`- Bond formation `" " (F) 2p_(x)+2p_(x)to sigma`-Bond formation

Options

A. A,B,C
B. C,F
C. B,E
D. B,C,D

Explanation

To determine which of the given overlaps is incorrect, we need to analyze each option based on the type of bond formed (sigma, pi, or delta) and the nature of the overlap involved. The Z-axis is assumed to be the internuclear axis.

### Step-by-Step Solution:

1. **Option A: \(2p_y + 2p_y \to \pi\) Bond Formation**
- The \(p_y\) orbitals overlap sidewise. This type of overlap results in the formation of a pi bond.
- **Conclusion:** This option is correct.

2. **Option B: \(2p_x + 2p_x \to \sigma\) Bond Formation**
- The \(p_x\) orbitals also overlap sidewise. This overlap should form a pi bond, not a sigma bond.
- **Conclusion:** This option is incorrect.

3. **Option C: \(3d_{xy} + 3d_{xy} \to \pi\) Bond Formation**
- The \(d_{xy}\) orbitals overlap in a way that allows for the formation of a delta bond, as they have four lobes that can overlap effectively.
- **Conclusion:** This option is incorrect.

4. **Option D: \(2s + 2p_y \to \pi\) Bond Formation**
- The \(s\) orbital is spherical and does not have a directional characteristic to overlap with \(p_y\) in a way that would form a pi bond. This overlap does not lead to bonding.
- **Conclusion:** This option is incorrect.

5. **Option E: \(3d_{xy} + 3d_{xy} \to \delta\) Bond Formation**
- The \(d_{xy}\) orbitals can overlap to form a delta bond due to their orientation and lobes.
- **Conclusion:** This option is correct.

6. **Option F: \(2p_x + 2p_x \to \sigma\) Bond Formation**
- Similar to option B, the \(p_x\) orbitals overlap sidewise, which leads to the formation of a pi bond, not a sigma bond.
- **Conclusion:** This option is incorrect.

### Summary of Incorrect Options:
- The incorrect overlaps are found in options B, C, D, and F.

### Final Answer:
- The overlaps that are incorrect are: **B, C, D, and F**.