The IUPAC name of the complex ` [Pt ( NH _ 3 ) _ 2 Cl _ 2 Br _ 2 ] ` is

Options

A. Diamminedichlorodibromopalatinate(IV)
B. Diamminedibromodichloroplatinum(IV)
C. Dichlorodiamminedibromopalatinate(II)
D. Diamminedibromodichloroplatinum(II)

Explanation

To determine the IUPAC name of the complex \([Pt(NH_3)_2Cl_2Br_2]\), we will follow a systematic approach. Here’s the step-by-step solution:

### Step 1: Identify the ligands and their counts
The complex contains:
- 2 molecules of ammonia \((NH_3)\)
- 2 chloride ions \((Cl^-)\)
- 2 bromide ions \((Br^-)\)

### Step 2: Determine the oxidation state of platinum
Let the oxidation state of platinum be \(x\).
- The ammonia \(NH_3\) is a neutral ligand, contributing \(0\) to the charge.
- Each chloride ion contributes \(-1\) (2 chloride ions contribute \(-2\)).
- Each bromide ion contributes \(-1\) (2 bromide ions contribute \(-2\)).

Setting up the equation for the overall charge:
\[ x + 0 + (-2) + (-2) = 0 \]
\[ x - 4 = 0 \implies x = +4 \]
Thus, the oxidation state of platinum is \(+4\).

### Step 3: Naming the ligands
- The ligand \(NH_3\) is named "ammine".
- The ligand \(Cl^-\) is named "chloro".
- The ligand \(Br^-\) is named "bromo".

### Step 4: Arranging the ligands in alphabetical order
When naming the complex, ligands are arranged in alphabetical order, irrespective of their prefixes:
- "ammine" (for \(NH_3\))
- "bromo" (for \(Br\))
- "chloro" (for \(Cl\))

### Step 5: Applying the prefixes
Since there are 2 of each type of ligand, we use the appropriate prefixes:
- For 2 ammines: "diammine"
- For 2 bromides: "dibromo"
- For 2 chlorides: "dichloro"

### Step 6: Constructing the IUPAC name
Putting it all together, we write the name:
- Start with the ligands in alphabetical order: "diammine", "dibromo", "dichloro".
- Finally, add the name of the metal with its oxidation state in Roman numerals: "platinum(IV)".

Thus, the complete IUPAC name is:
**Diamine-Dibromo-Dichloroplatinum(IV)**

### Final Answer
The IUPAC name of the complex \([Pt(NH_3)_2Cl_2Br_2]\) is **Diamine-Dibromo-Dichloroplatinum(IV)**.

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