The `pi` - bounded organometallic compound which has ethylene as one of its component is

Options

A. Dibenzene chromium
B. Zeise salt
C. Ferrocene
D. Tetraethyl tin

Answer

To solve the question regarding the pi-bonded organometallic compound that contains ethylene, we will analyze the given options step by step.

### Step 1: Understanding Pi-Bonded Organometallic Compounds
Pi-bonded organometallic compounds are those in which a metal is bonded to ligands through pi bonds. Common examples of such ligands include alkenes (like ethylene), alkynes, and aromatic compounds (like benzene).

### Step 2: Analyzing the Options
We need to evaluate each of the options provided to see if they contain ethylene and have a pi bond.

1. **Dibenzene Chromium (C6H6)2Cr**:
- Structure: This compound consists of chromium bonded to two benzene rings.
- Analysis: There is no ethylene (C2H4) in this compound. Thus, it cannot be the answer.

2. **Ziegler Salt (K[PtCl3(C2H4)])**:
- Structure: This compound contains platinum, chlorine, and an ethylene unit.
- Analysis: The presence of the ethylene unit (C2H4) indicates that this compound is indeed pi-bonded with ethylene. Therefore, this is a potential answer.

3. **Ferrocene (C5H5)2Fe**:
- Structure: Ferrocene consists of iron sandwiched between two cyclopentadienyl anions.
- Analysis: There are no alkenes or ethylene units present in this structure. Hence, it cannot be the answer.

4. **Tetraethyl Tin (Sn(C2H5)4)**:
- Structure: This compound consists of tin bonded to four ethyl groups.
- Analysis: The bonding here is primarily sigma bonding, and there is no ethylene or pi bond involved. Thus, this is not the answer.

### Step 3: Conclusion
After analyzing all the options, we find that the only compound that contains ethylene as a component and is a pi-bonded organometallic compound is **Ziegler Salt**.

### Final Answer:
The pi-bonded organometallic compound which has ethylene as one of its components is **Ziegler Salt (Option B)**.

---