The IUPA name of `[Co(NH_3)_4Cl(NO_2)]Cl` is

Options

A. tetraamminechloridonitrito - N - cobalt (III) chloride
B. tetraamminechloridonitritocobalt (II) chloride
C. tetraamminechloridonitritocobalt (I) chloride
D. tetraamminechloridonitritocobalt (III) chloride

Answer

To determine the IUPAC name of the complex compound \([Co(NH_3)_4Cl(NO_2)]Cl\), we will follow the systematic steps for naming coordination compounds.

### Step-by-Step Solution:

1. **Identify the Components**:
- The complex consists of a cobalt (Co) ion, ammonia (NH₃) ligands, chloride (Cl) ligands, and nitrite (NO₂) ligands.
- The overall formula indicates that cobalt is the central metal ion, surrounded by ligands.

2. **Determine the Oxidation State of Cobalt**:
- Ammonia (NH₃) is a neutral ligand (0 charge).
- Chloride (Cl) has a charge of -1.
- Nitrite (NO₂) can be either neutral or negatively charged, but in this case, it is considered as nitrito (NO₂⁻) which has a charge of -1.
- The overall charge of the complex is neutral, and since there is one Cl outside the bracket, it contributes -1 to the overall charge. Thus, the charge on the complex ion must be +1.
- Let the oxidation state of cobalt be \(x\):
\[ x + 4(0) + (-1) + (-1) = +1 \implies x - 2 = 1 \implies x = +3 \]
- Therefore, cobalt is in the +3 oxidation state.

3. **Naming the Ligands**:
- The ligands are named in alphabetical order, regardless of their charge.
- The ligands present are:
- Ammonia (NH₃) is named "ammine".
- Chloride (Cl) is named "chloro".
- Nitrite (NO₂) is named "nitrito".
- In alphabetical order, we have:
- Ammine (A)
- Chloro (C)
- Nitrito (N)

4. **Count the Number of Each Ligand**:
- There are 4 ammonia ligands, 1 chloride ligand, and 1 nitrito ligand.
- The prefixes used are:
- Tetra for 4 (ammine)
- Mono for 1 (chlorido)
- Mono for 1 (nitrito)

5. **Construct the Name of the Complex**:
- Combine the names of the ligands with their prefixes and the name of the metal.
- The name will be:
- Tetraammine for 4 NH₃
- Chloro for 1 Cl
- Nitrito for 1 NO₂
- The metal name is cobalt, with the oxidation state in Roman numerals (III).
- Therefore, the complete name of the complex is:
\[ \text{Tetraammine chloro nitrito cobalt(III)} \]

6. **Final Name of the Compound**:
- Since there is an additional chloride ion outside the coordination sphere, we add "chloride" at the end.
- The final IUPAC name is:
\[ \text{Tetraammine chloro nitrito cobalt(III) chloride} \]

### Final Answer:
**The IUPAC name of \([Co(NH_3)_4Cl(NO_2)]Cl\) is Tetraammine chloro nitrito cobalt(III) chloride.**