Which of the following statement is incorrect for ligand - metal complex

Options

A. Larger the donor atom of the ligand, the more stable is the metal - ligand bond
B. Highly charged ligand forms strong bond
C. Larger the permanent dipole moment of ligand, the more stable is the bond
D. Greater the ionization potential of central metal, the stronger is the bond

Answer

To determine which statement is incorrect regarding ligand-metal complexes, we will analyze each statement one by one.

### Step 1: Analyze the First Statement
**Statement:** "Larger the donor atoms of the ligand, the more stable is the metal-ligand bond."

**Analysis:** This statement is true. Larger donor atoms can better accommodate electron donation due to their size, leading to stronger and more stable bonds with the metal.

### Step 2: Analyze the Second Statement
**Statement:** "Highly charged ligands form strong bonds."

**Analysis:** This statement is incorrect. The strength of the bond between a ligand and a metal is not solely determined by the charge of the ligand. Instead, it depends on the availability of lone pair electrons on the ligand for donation. Therefore, this statement does not hold true universally.

### Step 3: Analyze the Third Statement
**Statement:** "Larger the permanent dipole of the ligand, the more stable is the bond."

**Analysis:** This statement is true. A larger permanent dipole indicates a greater difference in charge distribution, which can enhance the stability of the bond due to increased electrostatic interactions.

### Step 4: Analyze the Fourth Statement
**Statement:** "Greater the ionization potential of the central atom, stronger is the bond."

**Analysis:** This statement is also true. A higher ionization potential of the metal indicates that it holds onto its electrons more tightly, which can lead to stronger interactions with ligands and thus stronger bonds.

### Conclusion
After analyzing all the statements, we find that:
- Statements 1, 3, and 4 are true.
- Statement 2 is incorrect.

Therefore, the answer to the question is that the incorrect statement is option number 2.

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