Assertion: Zeise's salt is a `pi`-bonded organometallic compound.
Reason: Zeise's salt contain `C_(2)H_(4)` molecules as one of the ligand.

Options

A. If assertion is true but the reason is false
B. If assertion is false but reason is true
C. If both assertion and reason are true and the reason is the correct explanation of assertion
D. If both assertion and reason are true but reason is not the correct explanation of assertion

Answer

To solve the question regarding Zeise's salt, we need to analyze both the assertion and the reason provided.

### Step 1: Understanding the Assertion
The assertion states that "Zeise's salt is a π-bonded organometallic compound."

- **Definition**: An organometallic compound is one that contains a bond between a carbon atom of an organic molecule and a metal. In the case of Zeise's salt, it is composed of potassium (K), platinum (Pt), and an ethylene ligand (C2H4).
- **π-bonding**: The ethylene (C2H4) ligand has a double bond (C=C), which can interact with the metal center (Pt) through π-bonding. This means that the π electrons from the ethylene can be donated to the metal, forming a bond.

### Conclusion for Step 1
Since Zeise's salt contains both an organic component (C2H4) and a metal (Pt), and the ethylene ligand is π-bonded to the platinum, the assertion is correct.

### Step 2: Understanding the Reason
The reason states that "Zeise's salt contains C2H4 molecules as one of the ligands."

- **Ligand Identification**: In the structure of Zeise's salt, we can identify that it indeed contains C2H4 as a ligand. The ethylene molecule acts as a ligand that coordinates to the platinum center.
- **Structure**: The structure of Zeise's salt can be represented as K[PtCl3(C2H4)], where C2H4 is coordinated to the platinum.

### Conclusion for Step 2
Since the reason accurately describes the presence of the C2H4 ligand in Zeise's salt, the reason is also correct.

### Final Conclusion
Both the assertion and the reason are correct, and the reason provides a correct explanation for the assertion.

### Summary
- **Assertion**: Correct (Zeise's salt is a π-bonded organometallic compound).
- **Reason**: Correct (Zeise's salt contains C2H4 molecules as one of the ligands).
- **Relationship**: The reason is a correct explanation of the assertion.