The name of the complex `[Pt(NH_3)_6]Cl_4` is

Options

A. hexaammineplatinum (IV) chloride
B. hexaammineplatinum (II) chloride
C. tetrachlorohexaammineplatinum (IV)
D. tetrachlorohexaammineplatinum (II).

Explanation

To name the complex \([Pt(NH_3)_6]Cl_4\), we will follow the IUPAC naming conventions for coordination compounds. Here’s a step-by-step breakdown of the process:

### Step 1: Identify the central metal and its oxidation state
- The central metal in the complex is platinum (Pt).
- To find the oxidation state of platinum, we denote it as \(x\). The ligands (in this case, ammonia, \(NH_3\)) are neutral, contributing 0 to the charge.
- The overall charge of the complex is determined by the chloride ions, which are negatively charged. Since there are 4 chloride ions, they contribute a total charge of -4.
- The complex itself is neutral, so we set up the equation:
\[ x + 0 = +4 \quad (\text{since there are 4 chloride ions}) \]
- Solving for \(x\), we find that the oxidation state of platinum is +4.

### Step 2: Identify the ligands
- The ligand present in the complex is ammonia (\(NH_3\)), which is referred to as "ammine" in coordination chemistry.
- Since there are 6 ammonia ligands, we use the prefix "hexa-" to indicate the number of ligands.

### Step 3: Combine the names of the ligands and the central metal
- The name of the ligands comes first, followed by the name of the central metal.
- Therefore, we write "hexaammine" for the 6 ammonia ligands.
- The name of the central metal is "platinum".

### Step 4: Indicate the oxidation state of the central metal
- The oxidation state of platinum is +4, which we indicate in Roman numerals as (IV).
- Thus, we write "platinum(IV)".

### Step 5: Name the anion
- The anion present in the complex is chloride (Cl⁻).
- In coordination compound naming, the anion is named last, and we use "chloride" for the chloride ion.

### Final Name
Putting it all together, the full name of the complex \([Pt(NH_3)_6]Cl_4\) is:
**Hexaammineplatinum(IV) chloride.**

### Summary
The name of the complex \([Pt(NH_3)_6]Cl_4\) is **Hexaammineplatinum(IV) chloride.**