Bidentate ligands are

Options

A. `C_(2)O_(4)^(2-)`(oxalate)
B. en(ethylenediamine)
C. `DMG`(dimethyl glyoxime)
D. Gly (glycine)

Answer

### Step-by-Step Solution:

1. **Definition of Bidentate Ligands**:
- Bidentate ligands are molecules that have two donor atoms capable of donating a pair of electrons to a central metal atom in a coordination complex.

2. **Identifying Bidentate Ligands from Options**:
- We will analyze each option provided to determine if they are bidentate ligands.

3. **Option 1: Oxalate (C2O4^2-)**:
- The oxalate ion has two oxygen atoms that can donate lone pairs of electrons.
- Structure: It consists of two carbon atoms and four oxygen atoms.
- Conclusion: **Oxalate is a bidentate ligand**.

4. **Option 2: Ethylene Diamine (en)**:
- Ethylene diamine has two nitrogen atoms, each with a lone pair of electrons that can be donated to a metal center.
- Structure: It consists of two ethyl groups and two amine groups.
- Conclusion: **Ethylene diamine is a bidentate ligand**.

5. **Option 3: Dimethylglyoxime (DMG)**:
- Dimethylglyoxime contains two nitrogen atoms that can each donate a lone pair of electrons.
- Structure: It is structured with two carbon atoms connected to nitrogen and hydroxyl groups.
- Conclusion: **Dimethylglyoxime is a bidentate ligand**.

6. **Option 4: Glycine (NH2CH2COOH)**:
- Glycine has one nitrogen atom and one oxygen atom that can donate lone pairs of electrons.
- Structure: It consists of an amino group and a carboxylic acid group.
- Conclusion: **Glycine is a bidentate ligand**.

7. **Final Conclusion**:
- All the options provided (Oxalate, Ethylene Diamine, Dimethylglyoxime, and Glycine) are bidentate ligands.