Ferrocene is a compound of

Options

A. one `Fe^(2+)` and two `C_(5)H_(5)^(-)` ions
B. two `Fe^(2+)` and two `C_(5)H_(5)^(-)` ions
C. one `Fe^(3+)` and two `C_(5)H_(5)^(-)` ions
D. two `Fe^(3+)` and six `C_(5)H_(5)^(-)` ions.

Explanation

To determine the correct composition of ferrocene, we need to analyze the structure and the charges involved in the compound.

### Step-by-Step Solution:

1. **Understanding the Structure of Ferrocene**:
- Ferrocene consists of two cyclopentadienyl (C5H5) rings that are bonded to a central iron (Fe) atom.
- Each cyclopentadienyl ring carries a negative charge when it acts as a ligand.

2. **Identifying the Charges**:
- Each cyclopentadienyl ion (C5H5) has a charge of -1.
- Since there are two cyclopentadienyl ions in ferrocene, the total negative charge contributed by the rings is -2.

3. **Determining the Charge on Iron**:
- To balance the overall charge of the ferrocene molecule, the iron atom must have a charge that offsets the -2 charge from the two C5H5 ions.
- Therefore, the iron must have a charge of +2 (Fe2+) to balance the -2 charge from the two C5H5^- ions.

4. **Conclusion**:
- Thus, ferrocene is composed of 1 Fe2+ ion and 2 C5H5^- ions.
- Therefore, the correct answer is option 1: **1 Fe2+ and 2 C5H5^- ions**.

### Final Answer:
Ferrocene is a compound of **1 Fe2+ and 2 C5H5^- ions**.

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