The IUPAC name of `(CH_(3))_(3)C Cl` is

Options

A. 1-chloro-1, 1, 1-trichloromethane
B. 2-chloro-2-methylpropane
C. 2-chlorobutane
D. Trimethylchloromethane

Answer

To determine the IUPAC name of the compound `(CH₃)₃CCl`, we will follow these steps:

### Step 1: Identify the Structure
The compound `(CH₃)₃CCl` can be expanded to show that it consists of a central carbon atom (C) bonded to three methyl groups (CH₃) and one chlorine atom (Cl).

### Step 2: Determine the Longest Carbon Chain
In this case, the longest carbon chain consists of 3 carbon atoms. The structure can be visualized as:
```
CH₃
|
CH₃ - C - Cl
|
CH₃
```

### Step 3: Number the Carbon Chain
We can number the carbon chain from either end. However, in this case, regardless of whether we number from the top or the bottom, the carbon atom that is bonded to the chlorine atom will always receive the same number.

- If we number from the bottom:
1. C (Cl)
2. C (CH₃)
3. C (CH₃)

- If we number from the top:
1. C (CH₃)
2. C (Cl)
3. C (CH₃)

Both numbering methods give the chlorine atom a position of 2.

### Step 4: Identify the Substituents
The substituents on the carbon chain are:
- One chlorine atom (Cl)
- Three methyl groups (CH₃)

### Step 5: Name the Substituents
In IUPAC nomenclature, we list the substituents in alphabetical order. The substituent "chloro" comes before "methyl" in alphabetical order.

### Step 6: Combine the Names
The substituents are located at carbon 2. Therefore, we write:
- 2-chloro (for the chlorine)
- 2-methyl (for the methyl groups)

### Step 7: Determine the Base Name
Since there are three carbon atoms in the longest chain and all are connected by single bonds, the base name is "propane."

### Step 8: Finalize the IUPAC Name
Putting it all together, we have:
**2-chloro-2-methylpropane**

### Final Answer
The IUPAC name of `(CH₃)₃CCl` is **2-chloro-2-methylpropane**.

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