Which of the following is an unsymmetrical bidentate ligand?

Options

A. gly
B. en
C. ox
D. `SO_(4)^(2-)`

Answer

To determine which of the following is an unsymmetrical bidentate ligand, we need to analyze each option based on the definition of unsymmetrical bidentate ligands. An unsymmetrical bidentate ligand has two different donor atoms that can coordinate to a metal ion.

### Step-by-Step Solution:

1. **Understand the Definition**:
- A bidentate ligand is a ligand that can attach to a metal ion at two different points.
- An unsymmetrical bidentate ligand has two different types of donor atoms.

2. **Analyze Each Option**:
- **Option 1: Glycinate (NH2-CH2-COO-)**:
- Glycinate has two different donor sites: the amine group (NH2) and the carboxylate group (COO-).
- Since these are different types of donor atoms, glycinate is an unsymmetrical bidentate ligand.

- **Option 2: Ethylenediamine (en)**:
- Ethylenediamine has two amine groups (NH2).
- Since both donor sites are the same, it is a symmetrical bidentate ligand.

- **Option 3: Oxalate (C2O4^2-)**:
- Oxalate has two carboxylate groups (COO-).
- Similar to ethylenediamine, it is also a symmetrical bidentate ligand.

- **Option 4: Sulfate ion (SO4^2-)**:
- The sulfate ion does not have two donor atoms that can coordinate to a metal ion in a bidentate manner. It is typically a monodentate ligand.

3. **Conclusion**:
- Based on the analysis, the only unsymmetrical bidentate ligand among the options is **Option 1: Glycinate**.

### Final Answer:
**The correct answer is Option 1: Glycinate.**