Which is the pair of ambidentate ligand?

Options

A. `CN^(-),NO_(2)^(-)`
B. `NO_(3)^(-),SCN^(-)`
C. `N_(3)^(-),NO_(2)^(-)`
D. `NCS^(-),C_(2)O_(4)^(2-)`

Answer

To determine the pair of ambidentate ligands, we first need to understand what ambidentate ligands are. Ambidentate ligands are monodentate ligands that can coordinate to a central metal atom through more than one atom.

### Step-by-step Solution:

1. **Definition of Ambidentate Ligands**:
- Ambidentate ligands are ligands that can bind to a metal ion through two different atoms. For example, the nitrito ligand (NO2) can coordinate through either nitrogen or oxygen.

2. **Examples of Ambidentate Ligands**:
- Common examples of ambidentate ligands include:
- Nitrito (NO2), which can bind through nitrogen (N) or oxygen (O).
- Thioscyanate (SCN), which can bind through sulfur (S) or nitrogen (N).
- Cyanate (OCN), which can bind through carbon (C) or nitrogen (N).

3. **Analyzing the Given Options**:
- We need to check the options provided in the question to identify pairs of ambidentate ligands.
- For example, if the options include NO2 and SCN, both are ambidentate ligands:
- NO2 can coordinate through N or O.
- SCN can coordinate through S or N.

4. **Conclusion**:
- After analyzing the options, we find that the correct pair of ambidentate ligands is **NO2 and SCN**.

### Final Answer:
The pair of ambidentate ligands is **NO2 and SCN**.