Incorrect order of IP is :-

Options

A. `Cu^(+2) gt Zn^(+)`
B. `Cu lt Zn`
C. `Tl lt Al`
D. `Pd gt Ag`

Answer

To determine the incorrect order of ionization potential (IP) from the given options, we need to analyze the ionization potentials of the elements involved based on their electronic configurations and periodic trends.

### Step-by-Step Solution:

1. **Understanding Ionization Potential Trends:**
- Ionization potential generally increases across a period (left to right) due to decreasing atomic size and increasing nuclear charge.
- Ionization potential generally decreases down a group due to increasing atomic size and the increased distance between the nucleus and the outermost electrons.

2. **Analyzing Each Option:**
- **Option A:** Copper (Cu⁺) > Zinc (Zn²⁺)
- Electronic configuration:
- Cu⁺: [Ar] 3d¹⁰
- Zn²⁺: [Ar] 3d¹⁰
- Both have the same configuration, but Cu⁺ has a filled 3d subshell, making it harder to remove an electron compared to Zn²⁺. Thus, this order is correct.

- **Option B:** Copper (Cu) < Zinc (Zn)
- Electronic configuration:
- Cu: [Ar] 3d¹⁰ 4s¹
- Zn: [Ar] 3d¹⁰ 4s²
- Cu has a half-filled 4s orbital, while Zn has a fully filled 4s orbital. It is easier to remove an electron from the half-filled orbital of Cu than from the fully filled orbital of Zn. Thus, this order is correct.

- **Option C:** Thallium (Tl) < Aluminum (Al)
- Electronic configuration:
- Tl: [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p¹
- Al: [Ne] 3s² 3p¹
- As we move down the group, the ionization potential decreases. Therefore, Al has a higher ionization potential than Tl. This order is correct.

- **Option D:** Palladium (Pd) > Silver (Ag)
- Electronic configuration:
- Pd: [Kr] 4d¹⁰
- Ag: [Kr] 4d¹⁰ 5s¹
- Silver has an additional electron in the 5s orbital, making it easier to remove compared to the fully filled 4d subshell of palladium. Thus, the correct order should be Ag > Pd, making this order incorrect.

3. **Conclusion:**
- The incorrect order of ionization potential is **Option D: Palladium (Pd) > Silver (Ag)**.

### Final Answer:
The incorrect order of ionization potential is **Option D**.