Which of the following ligand `(s)` is/are ambidentate ?

Options

A. `NOS^(Θ)`
B. `SCN^(Θ)`
C. `NO_(2)^(Θ)`
D. `CH_(3)COO^(Θ)`

Answer

To determine which of the given ligands are ambidentate, we will analyze each ligand based on the definition of ambidentate ligands. Ambidentate ligands are those that can coordinate to a central metal atom through two different atoms.

### Step-by-Step Solution:

1. **Understanding Ambidentate Ligands**:
- Ambidentate ligands can bind to a metal atom through two different types of donor atoms. This means they have more than one potential donor site.

2. **Analyzing Each Ligand**:
- **Ligand 1: NOS⁻ (Nitroso)**:
- This ligand contains nitrogen (N), oxygen (O), and sulfur (S).
- Both nitrogen and oxygen can act as donor atoms to the central metal atom. Therefore, NOS⁻ is an ambidentate ligand.

- **Ligand 2: SCN⁻ (Thiocyanate)**:
- This ligand consists of sulfur (S) and nitrogen (N).
- Either sulfur or nitrogen can coordinate to the metal center. Hence, SCN⁻ is also an ambidentate ligand.

- **Ligand 3: NO₂⁻ (Nitrite)**:
- This ligand has nitrogen (N) and oxygen (O).
- Both nitrogen and oxygen can act as donor atoms, making NO₂⁻ an ambidentate ligand as well.

- **Ligand 4: CH₃COO⁻ (Acetate)**:
- This ligand contains a carbon (C) double bonded to oxygen (O) and a negatively charged oxygen (O⁻).
- Here, only the negatively charged oxygen can act as a donor atom. There is no second donor atom, so CH₃COO⁻ is not an ambidentate ligand.

3. **Conclusion**:
- The ligands that are ambidentate are NOS⁻, SCN⁻, and NO₂⁻.
- Therefore, the answer is: **1, 2, and 3**.