How many `pi-` bonds are present in ferrocene?

Explanation

To determine the number of π bonds present in ferrocene, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Ferrocene**:
Ferrocene is an organometallic compound consisting of two cyclopentadienyl (Cp) rings bonded to a central iron (Fe) atom. Each cyclopentadienyl ring is an aromatic system.

2. **Identify the Cyclopentadienyl Rings**:
Each cyclopentadienyl ring (C5H5) has a total of 6 π electrons due to its conjugated double bonds. The structure is planar and follows Huckel's rule for aromaticity.

3. **Count the Total π Electrons**:
Since there are two cyclopentadienyl rings in ferrocene, the total number of π electrons is:
\[ 6 \text{ (from the first ring)} + 6 \text{ (from the second ring)} = 12 \text{ π electrons} \]

4. **Determine the Number of π Bonds**:
Each π bond is formed by a pair of π electrons. Therefore, to find the number of π bonds, we divide the total number of π electrons by 2:
\[ \text{Number of π bonds} = \frac{12 \text{ π electrons}}{2} = 6 \text{ π bonds} \]

5. **Conclusion**:
Thus, ferrocene contains a total of 6 π bonds.

### Final Answer:
Ferrocene has **6 π bonds**.

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