The formula of the complex diamminechloro-(ethylenediamine) nitroplatinum (IV) chloride is

Options

A. `[Pt(NH_(3))_(2)Cl(en)NO_(2)]Cl_(2)`
B. `Pt[Pt(NH_(3))_(2)(en) Cl_(2)NO_(2)]`
C. `Pt[(NH_(3))_(2) (en) NO_(2) ] Cl_(2)`
D. `Pt[(NH_(3))_(2) (en) NO_(2)Cl_(2)]`

Answer

To determine the formula of the complex diamminechloro-(ethylenediamine) nitroplatinum (IV) chloride, we will follow a systematic approach based on the nomenclature rules for coordination compounds.

### Step-by-Step Solution:

1. **Identify the Ligands and Their Charges:**
- The ligands mentioned are:
- **Diammine**: This refers to two ammonia (NH3) molecules, which are neutral ligands.
- **Chloro**: This refers to a chloride ion (Cl⁻), which has a charge of -1.
- **Ethylenediamine**: This is a neutral ligand (NH2-CH2-CH2-NH2), which has no charge.
- **Nitro**: This refers to a nitro group (NO2⁻), which has a charge of -1.
- The metal is platinum (Pt) with an oxidation state of +4.

2. **Write the Formula Based on Ligands:**
- The ligands are arranged in alphabetical order (ignoring prefixes like di- and tri-).
- The order is:
- Ethylenediamine (en)
- Amine (NH3)
- Chloro (Cl)
- Nitro (NO2)
- Therefore, the formula starts with the ligands followed by the metal.

3. **Determine the Overall Charge:**
- The total charge contributed by the ligands:
- Diammine (2 × 0) = 0 (neutral)
- Ethylenediamine (0) = 0 (neutral)
- Chloro (1 × -1) = -1
- Nitro (1 × -1) = -1
- Total charge from ligands = 0 + 0 - 1 - 1 = -2.
- The platinum has a +4 charge. Therefore, the overall charge of the complex is +4 - 2 = +2.

4. **Construct the Formula:**
- The formula of the complex can be written as:
- [Pt(en)(NH3)2Cl2(NO2)]Cl
- Here, we have 2 chloride ions outside the coordination sphere to balance the overall charge of +2.

5. **Final Formula:**
- The final formula of the complex is:
- [Pt(en)(NH3)2Cl2(NO2)]Cl