Which of the following ligands can show linkage isomerism?

Options

A. `NO_(2)^(-)`
B. `SCN^(-)`
C. `CNO^(-)`
D. `CO_(3)^(2-)`

Explanation

To determine which ligands can show linkage isomerism, we need to identify ambidentate ligands. Ambidentate ligands are those that can bind to a metal center through two different atoms. Here’s a step-by-step solution:

### Step 1: Identify the Ligands
The ligands provided in the question are:
1. NO2⁻ (Nitro)
2. Thiocyanate (SCN⁻)
3. CNO⁻ (Isocyanate)
4. Carbonate (CO3²⁻)

### Step 2: Analyze Each Ligand for Ambidentate Nature
1. **NO2⁻ (Nitro)**:
- This ligand can bind through nitrogen (N) or oxygen (O).
- Therefore, it is an ambidentate ligand and can show linkage isomerism.

2. **Thiocyanate (SCN⁻)**:
- This ligand can bind through sulfur (S) or nitrogen (N).
- Thus, it is also an ambidentate ligand and can show linkage isomerism.

3. **CNO⁻ (Isocyanate)**:
- This ligand can bind through carbon (C) or oxygen (O).
- Hence, it is another ambidentate ligand and can show linkage isomerism.

4. **Carbonate (CO3²⁻)**:
- This ligand can only bind through oxygen (O) and does not have an alternative binding atom.
- Therefore, it is not an ambidentate ligand and cannot show linkage isomerism.

### Step 3: Conclusion
The ligands that can show linkage isomerism are:
- NO2⁻ (Nitro)
- Thiocyanate (SCN⁻)
- CNO⁻ (Isocyanate)

The ligand that cannot show linkage isomerism is:
- Carbonate (CO3²⁻)

### Final Answer
The ligands that can show linkage isomerism are: NO2⁻, SCN⁻, and CNO⁻.

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