Question

The correct statement among the following is:

• A. Ferrocene has two cyclohexadiene rings coordinated to iron atom.
• B. Ferrocene has two cyclopentadienyl anion rings bonded to iron (II) ion.
• C. Perxenate ion is [XeO₂F₂]²⁻.
• D. Perxenate ion is tetrahedral in shape.

Hint:

Ferrocene is an organometallic compound with a stable, sandwich-like structure.

Answer 1

The Correct Option is B

Step 1: Structure of Ferrocene Ferrocene is \({Fe}(\eta^5 - {C}_5{H}_5)_2\).
It consists of two \(\eta^5\)-cyclopentadienyl ({Cp}$^-$) anions bonded to an Fe$^{2+}$ ion.
It exhibits a "sandwich" structure with iron between two parallel Cp rings.

Answer 2

The correct statement is:

Ferrocene is an organometallic compound consisting of an iron (II) ion sandwiched between two cyclopentadienyl anion rings.

Each cyclopentadienyl ring acts as a five-electron donor ligand, and together they form a very stable sandwich complex.

The bonding involves the overlap of the iron's d orbitals with the π orbitals of the cyclopentadienyl rings, resulting in strong metal-ligand interactions.

This unique structure gives ferrocene exceptional stability and aromatic character, making it a classic example of a metallocene.

Hence, the statement "Ferrocene has two cyclopentadienyl anion rings bonded to iron (II) ion" accurately describes the compound.