IUPAC name of `[Co(en)_(2)Cl_(2)]Cl` is

Options

A. dichloridobis (ethylene diammine) cobalt (III) Chloride.
B. dichloridobis (ethylenediammine) cobalt (III) Chloride
C. dichlorobis (ethlene diamine) cobalt (III) Chloride.
D. dichloridobis (ethylene diamine) cobalt (III) chloride

Explanation

To determine the IUPAC name of the coordination complex \([Co(en)_{2}Cl_{2}]Cl\), we will follow a systematic approach. Here’s the step-by-step solution:

### Step 1: Identify the Coordination Complex
The given complex is \([Co(en)_{2}Cl_{2}]Cl\). This indicates that we have a cobalt ion coordinated with two ethylenediamine (en) ligands and two chloride (Cl) ligands.

### Step 2: Determine the Charge of the Complex
When the complex dissociates, it forms a cationic part \([Co(en)_{2}Cl_{2}]^{+}\) and a chloride anion (Cl⁻). The overall charge of the complex is +1, as indicated by the presence of one chloride ion outside the coordination sphere.

### Step 3: Assign Oxidation State to Cobalt
Let the oxidation state of cobalt be \(X\). The ligands are as follows:
- Ethylenediamine (en) is a neutral ligand, contributing 0 to the oxidation state.
- Each chloride ion has an oxidation state of -1.

The equation for the oxidation state can be set up as:
\[ X + 0 \cdot 2 + (-1) \cdot 2 = +1 \]
This simplifies to:
\[ X - 2 = +1 \]
Solving for \(X\):
\[ X = +3 \]
Thus, the oxidation state of cobalt is +3.

### Step 4: Name the Ligands
According to IUPAC nomenclature, we name the ligands in alphabetical order:
- The two ethylenediamine ligands are named as "bis-ethylenediamine" (since "bis" is used for two identical ligands).
- The two chloride ligands are named as "dichloro".

### Step 5: Combine the Names
Now, we combine the names of the ligands with the name of the metal:
- The cationic part is named as "dichloro bis-ethylenediamine cobalt".
- Since cobalt is in the +3 oxidation state, we denote this as "cobalt(III)".

### Step 6: Include the Counter Ion
Finally, we include the name of the counter ion, which is chloride (Cl⁻).

### Final IUPAC Name
Putting it all together, the IUPAC name of the compound \([Co(en)_{2}Cl_{2}]Cl\) is:
**dichloro bis-ethylenediamine cobalt(III) chloride**.

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