The correct IUPAC name for `[CrF_2 (e n)_2]Cl` is

Options

A. Chloro difluorido ethylene diaminechromium (III) chloride
B. Difluoridobis (ethylene diamine) chromium (III) chloride
C. Difluorobis-(ethylene diamine) chromium (III) chloride
D. Chloro difluoridobis (ethylene diamine) chromium (III)

Explanation

To determine the correct IUPAC name for the coordination compound \([CrF_2(en)_2]Cl\), we will follow a systematic approach.

### Step-by-Step Solution:

1. **Identify the components of the complex:**
- The complex consists of a chromium (Cr) metal center, two fluoride (F) ligands, and two ethylenediamine (en) ligands. Additionally, there is a chloride (Cl) ion outside the coordination sphere.

2. **Determine the oxidation state of the metal:**
- The fluoride ion (F) has a charge of -1, and there are two fluoride ions, contributing a total charge of -2.
- Ethylenediamine (en) is a neutral ligand, contributing 0 to the charge.
- Let the oxidation state of chromium be \(x\). The overall charge of the complex must be neutral since it is a coordination compound.
- The equation can be set up as:
\[ x + (-2) + 0 = 0 \implies x = +2 \]
- Therefore, the oxidation state of chromium in this complex is +2.

3. **Name the ligands:**
- The ligands are named in alphabetical order based on their names, regardless of their charges.
- The fluoride ion is named as "fluoro".
- The ethylenediamine (en) ligand is named as "ethylenediamine" (it is a bidentate ligand).
- Therefore, we have:
- 2 Fluoro ligands: "difluoro"
- 2 Ethylenediamine ligands: "diethylenediamine"

4. **Combine the names of the ligands:**
- The ligands are combined in alphabetical order, so we write "diethylenediamine" before "difluoro".
- Thus, the ligand part of the name becomes: "diethylenediamine difluoro".

5. **Name the metal and its oxidation state:**
- The metal is chromium, and since we have determined its oxidation state to be +2, we denote this in the name as "chromium(II)".

6. **Combine all parts to form the complete name:**
- The complete name of the coordination compound is:
\[ \text{diethylenediamine difluorochromium(II) chloride} \]

### Final Answer:
The correct IUPAC name for \([CrF_2(en)_2]Cl\) is **diethylenediamine difluorochromium(II) chloride**.