Which of the following is correct for zeise.s salt ?

Options

A. The complex ion is square planar
B. The CMI, Pt is in + 2 oxidation state
C. `H_(2)C=CH_(2)` Molecule is perpendicular to the `PtCl_(3)` plane
D. All of these

Answer

To solve the question regarding Zeise's salt, we will analyze the information provided and derive the correct statements step by step.

### Step 1: Identify the Molecular Formula
Zeise's salt is known to have the molecular formula K[PtCl3(C2H4)]. This indicates that it contains potassium (K), platinum (Pt), chlorine (Cl), and ethylene (C2H4).

**Hint:** Look for the components that make up Zeise's salt, including the metal, ligands, and counter ions.

### Step 2: Determine the Coordination Number
In Zeise's salt, there are four ligands attached to the platinum ion: three chloride ions and one ethylene molecule. Therefore, the coordination number of platinum in Zeise's salt is 4.

**Hint:** Count the number of ligands attached to the central metal ion to find the coordination number.

### Step 3: Assign Oxidation State of Platinum
Let’s denote the oxidation state of platinum as X. The oxidation state can be calculated using the formula:
\[ X + 1 + 3(-1) + 0 = 0 \]
Where:
- +1 is from potassium (K)
- -1 is from each of the three chloride ions (Cl)
- 0 is from the ethylene ligand (C2H4)

Solving this gives:
\[ X - 3 + 1 = 0 \]
\[ X - 2 = 0 \]
\[ X = +2 \]
Thus, the oxidation state of platinum in Zeise's salt is +2.

**Hint:** Use the charge balance method to find the oxidation state of the metal ion.

### Step 4: Determine the Geometry of the Complex
The geometry of Zeise's salt is square planar due to the arrangement of the ligands around the platinum ion. This is typical for coordination complexes with a coordination number of 4, especially when involving d8 metal ions like platinum.

**Hint:** Recall the common geometries associated with different coordination numbers.

### Step 5: Identify the Type of Complex
Zeise's salt is classified as a pi-bonded complex because the ethylene ligand donates its pi electrons to the platinum ion, forming a coordinate bond. This interaction is characteristic of olefin complexes.

**Hint:** Consider how ligands interact with the metal center to determine the type of bonding.

### Conclusion
Based on the analysis:
1. Coordination number is 4.
2. Oxidation state of platinum is +2.
3. Geometry is square planar.
4. It is a pi-bonded complex.

Thus, all statements regarding Zeise's salt are correct, leading us to conclude that the answer to the question is option D.

### Final Answer
The correct statements for Zeise's salt are all true, hence the answer is option D.