Select correct statement(s) regarding `[Ni(DMG)_(2)]` complex compound:

Options

A. it acts as oxidinsing agnet because `Ni^(2+)` cation is having E.A.N. 34.
B. It is extra stabilized by hydrogen bonding
C. It's IUPAC name is Bis(dimethylyoximato)nickelate(II)
D. It's ligand contains two different donar sites

Answer

To solve the question regarding the complex compound `[Ni(DMG)₂]`, we will analyze each statement provided and determine its correctness based on our understanding of coordination compounds.

### Step-by-Step Solution:

1. **Understanding the Complex:**
- The complex `[Ni(DMG)₂]` consists of nickel (Ni) as the central metal atom and dimethylglyoxime (DMG) as the ligand. DMG is a bidentate ligand, meaning it can coordinate to the metal through two donor atoms.

2. **Analyzing Statement 1:**
- **Statement:** It acts as an oxidizing agent because nickel 2+ cation has an effective atomic number (EN) of 34.
- **Analysis:** The effective atomic number (EN) is calculated using the formula:
\[ \text{EN} = Z - X + Y \]
where \( Z \) is the atomic number of nickel (28), \( X \) is the number of electrons lost (2 for Ni²⁺), and \( Y \) is the number of electrons donated by ligands (8 from two DMG ligands). Thus, EN = 28 - 2 + 8 = 34. To achieve a stable EN of 36, it would need 2 more electrons. However, due to exceptions in EN behavior, it does not act as an oxidizing agent.
- **Conclusion:** This statement is **incorrect**.

3. **Analyzing Statement 2:**
- **Statement:** It is extra stabilized by hydrogen bonding.
- **Analysis:** The extra stability of the complex is due to the formation of a chelate ring (five-membered) from the bidentate ligand DMG, not hydrogen bonding. Five-membered chelate rings are known for their stability due to minimal angle strain.
- **Conclusion:** This statement is **incorrect**.

4. **Analyzing Statement 3:**
- **Statement:** Its IUPAC name is bis-dimethyl-glyoxymato-nicolate(II).
- **Analysis:** The correct IUPAC name should reflect that the complex is neutral. The correct name is bis(dimethylglyoximato)nickel(II), as the ligand is neutral and does not take the suffix "-ate".
- **Conclusion:** This statement is **incorrect**.

5. **Analyzing Statement 4:**
- **Statement:** Its ligand contains two different donor sites.
- **Analysis:** DMG is a bidentate ligand, but it has only one type of donor site (the oxygen atoms). It does not have two different donor sites; hence this statement is misleading.
- **Conclusion:** This statement is **incorrect**.

### Final Conclusion:
All the statements regarding the complex `[Ni(DMG)₂]` are incorrect.