The IUPAC name of `Fe(CO)_(5)` is _________.

Options

A. pentacarbonylferrate (0)
B. pentacarbonyferrate(III)
C. pentacarbonyliron (0)
D. pentacarbonyliron (II)

Answer

To determine the IUPAC name of the coordination compound `Fe(CO)5`, we can follow these steps:

### Step 1: Identify the Ligand
The ligand in this compound is carbon monoxide (CO), which is commonly referred to as "carbonyl" in coordination chemistry.

**Hint:** Remember that ligands are named first in the IUPAC naming convention.

### Step 2: Count the Number of Ligands
In `Fe(CO)5`, there are five carbonyl ligands. The prefix used for five is "penta."

**Hint:** Use Greek prefixes to denote the number of ligands (mono-, di-, tri-, tetra-, penta-, etc.).

### Step 3: Combine the Ligand Name with the Count
Since we have five carbonyl ligands, we combine the prefix "penta" with the ligand name "carbonyl" to get "penta carbonyl."

**Hint:** Always combine the prefix with the ligand name without any spaces.

### Step 4: Identify the Central Metal Atom
The central metal atom in this compound is iron (Fe).

**Hint:** The name of the metal follows the ligand names in the IUPAC naming convention.

### Step 5: Determine the Oxidation State of the Metal
Carbon monoxide (CO) is a neutral ligand, which means it does not contribute any charge. Therefore, the oxidation state of iron must be zero in this complex.

To find the oxidation state (X) of iron:
- The overall charge of the complex is zero.
- Since CO is neutral, we have:
\[ X + 0 = 0 \implies X = 0 \]

**Hint:** Neutral ligands do not affect the overall charge of the complex.

### Step 6: Write the Complete Name
Now we can write the complete IUPAC name by combining all the parts:
- Ligand: penta carbonyl
- Metal: iron
- Oxidation state: zero (0) is denoted in Roman numerals as "0".

The complete IUPAC name of `Fe(CO)5` is **penta carbonyl iron(0)**.

**Final Answer:** The IUPAC name of `Fe(CO)5` is **penta carbonyl iron(0)**.

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