Which of the following is/are example (s) of o-bonded organometallic compound?

Options

A. `Al_(2)(CH_(3))_(6)`
B. `Pb(CH_(3))_(4)`
C. `Zn(C_(2)H_(5))_(2)`
D. Ferrocene

Answer

To determine which of the given compounds are examples of σ-bonded organometallic compounds, we will analyze each option based on the definition of organometallic compounds and the nature of the bonding involved.

### Step-by-Step Solution:

1. **Understanding Organometallic Compounds**:
- Organometallic compounds are defined as compounds that contain at least one bond between a carbon atom of an organic molecule and a metal. The bonding can be σ (sigma) or π (pi) type.
- For this question, we are specifically looking for σ-bonded organometallic compounds.

2. **Analyzing Each Option**:
- **Option 1: Al₂(CH₃)₆**:
- This compound consists of aluminum (Al) and methyl groups (CH₃). The bonding between Al and CH₃ is a σ bond.
- **Conclusion**: This is a σ-bonded organometallic compound.

- **Option 2: Pb(CH₃)₄**:
- This compound consists of lead (Pb) and four methyl groups (CH₃). The Pb-CH₃ bonds are also σ bonds.
- **Conclusion**: This is a σ-bonded organometallic compound.

- **Option 3: Zn(C₂H₅)₂**:
- This compound consists of zinc (Zn) and two ethyl groups (C₂H₅). The Zn-C bonds are σ bonds.
- **Conclusion**: This is a σ-bonded organometallic compound.

- **Option 4: Ferrocene (Fe(C₅H₅)₂)**:
- Ferrocene consists of iron (Fe) sandwiched between two cyclopentadienyl (C₅H₅) anions. The bonding between Fe and C in the cyclopentadienyl rings involves π-bonding.
- **Conclusion**: This is not a σ-bonded organometallic compound.

3. **Final Answer**:
- The correct examples of σ-bonded organometallic compounds from the options provided are:
- Option 1: Al₂(CH₃)₆
- Option 2: Pb(CH₃)₄
- Option 3: Zn(C₂H₅)₂

### Summary of Correct Options:
- **Correct Options**: 1, 2, and 3 are examples of σ-bonded organometallic compounds.