Which is a pair of ambidentate ligands among the following?

Options

A. (a) `CN^(-), NO_2^(-)`
B. (b) `NO_3^(-), NO_2^(-)`
C. (c) `CNS^(-), C_2O_4^(-2)`
D. (d) `C_2O_4^(-2), SO_4^(-2)`

Explanation

To determine which is a pair of ambidentate ligands among the given options, we first need to understand what ambidentate ligands are.

### Step-by-Step Solution:

1. **Definition of Ambidentate Ligands**:
- Ambidentate ligands are those ligands that can coordinate to a central metal atom through two different atoms. This means they have more than one donor atom that can donate an electron pair to the metal.

2. **Analyzing the Options**:
- We need to look at the ligands provided in the options and identify which ones can act as ambidentate ligands.

3. **Identifying Ligands**:
- Let's consider the ligands mentioned in the video transcript:
- **CN⁻ (Cyanide)**: This ligand can coordinate through the carbon atom or the nitrogen atom, making it ambidentate.
- **NO₂⁻ (Nitrite)**: This ligand can coordinate through the nitrogen atom or one of the oxygen atoms, also making it ambidentate.
- **N₃⁻ (Azide)**: This ligand can coordinate through the terminal nitrogen atoms, but it is not typically classified as ambidentate in the same way as CN⁻ or NO₂⁻.
- **CNS⁻ (Thiocyanate)**: This ligand can coordinate through the carbon atom or the sulfur atom, making it ambidentate as well.

4. **Conclusion**:
- From the analysis, the pairs of ambidentate ligands are:
- **CN⁻ and NO₂⁻**
- **CNS⁻ and NO₂⁻**
- Therefore, the answer to the question is that **CN⁻ and NO₂⁻** form a pair of ambidentate ligands.