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

Options

A. it acts as oxidising 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 answer the question regarding the complex compound `[Ni(DMG)₂]`, we will analyze the statements provided and determine which one is correct. Here’s a step-by-step breakdown of the solution:

### Step 1: Identify the Ligand
The ligand in the complex is DMG, which stands for dimethylglyoxime. The structure of DMG can be represented as follows:

- DMG has two donor atoms: one nitrogen (N) and one oxygen (O).
- Since it has two donor sites, it is classified as a bidentate ligand.

**Hint:** Remember that bidentate ligands can coordinate to a metal ion through two different atoms.

### Step 2: Determine the Oxidation State of Nickel
To find the oxidation state of nickel in the complex `[Ni(DMG)₂]`, we can use the following reasoning:

- Each DMG ligand has a charge of -1.
- Since there are two DMG ligands, the total negative charge contributed by the ligands is -2.
- Assuming the overall charge of the complex is neutral (0), we can set up the equation:

\[ \text{Oxidation state of Ni} + 2(-1) = 0 \]

This simplifies to:

\[ \text{Oxidation state of Ni} = +2 \]

**Hint:** The oxidation state can be calculated by balancing the charges in the complex.

### Step 3: Calculate the Effective Atomic Number (EAN)
The Effective Atomic Number (EAN) can be calculated using the formula:

\[ \text{EAN} = Z - \text{Oxidation state} + \text{Electrons from ligands} \]

Where:
- \( Z \) (atomic number of Ni) = 28
- Oxidation state = +2
- Each DMG contributes 2 electrons (one from N and one from O), and there are 2 DMG ligands, so total contribution = 4 electrons.

Now substituting the values:

\[ \text{EAN} = 28 - 2 + 4 = 30 \]

**Hint:** EAN helps to determine the stability of the complex and whether it is short of electrons for a noble gas configuration.

### Step 4: Analyze Stability Factors
The stability of the `[Ni(DMG)₂]` complex is primarily due to the chelation effect, where the formation of rings enhances stability.

- The complex does not act as an oxidizing agent in this context.
- There is no significant hydrogen bonding stabilizing the structure.
- The IUPAC name is not "bis dimethoxy glyoxymate" since the correct term should include "glyoxime."

**Hint:** The chelation effect is a key factor in the stability of coordination compounds.

### Step 5: Evaluate the Statements
Now, let's evaluate the statements provided:

1. **It acts as an oxidizing agent** - **False**
2. **It is extra stabilized by hydrogen bonding** - **False**
3. **IUPAC name is bis dimethoxy glyoxymate** - **False**
4. **The ligand contains two different donor sites** - **True**

The only correct statement is that the ligand contains two different donor sites (N and O).

### Final Answer
The correct statement regarding the complex compound `[Ni(DMG)₂]` is that the ligand contains two different donor sites.

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