The IUPAC name of `(CH_3)_3 C * CH_2 CH_2 Cl` is

Options

A. 2, 2-Dimethyl-4-chloro butane
B. 1-Chloro-3, 3-dimethylbutane
C. 4-Chloro-2, 2-dimethyl butane
D. none of these

Explanation

To determine the IUPAC name of the compound `(CH_3)_3C-CH_2CH_2Cl`, we can follow these steps:

### Step 1: Identify the Structure
The compound can be represented as follows:
- There is a central carbon atom connected to three methyl groups (CH₃).
- This carbon is connected to a CH₂ group, which is further connected to another CH₂ group that has a chlorine atom (Cl) attached.

### Step 2: Determine the Parent Chain
The longest continuous carbon chain must be identified. In this case, the longest chain consists of four carbon atoms:
1. The central carbon with three methyl groups.
2. The first CH₂ connected to it.
3. The second CH₂ connected to the first CH₂.
4. The carbon connected to the chlorine atom.

This gives us a four-carbon chain, which corresponds to "butane".

### Step 3: Number the Carbon Chain
We will number the carbon chain starting from the end nearest to the chlorine atom to give it the lowest possible number:
1. C1: CH₂Cl
2. C2: CH₂
3. C3: (central carbon with three CH₃ groups)
4. C4: CH₃ (the three methyl groups are attached here)

### Step 4: Identify Substituents
Now we need to identify the substituents:
- At C1, we have a chloro (Cl) substituent.
- At C3, we have two methyl (CH₃) groups.

### Step 5: Write the IUPAC Name
According to IUPAC nomenclature rules:
- The substituents are listed in alphabetical order.
- The chloro group comes first (C) followed by the methyl groups (M).

Thus, we write:
- Chloro at position 1: "1-chloro"
- Two methyl groups at position 3: "3,3-dimethyl"

Combining these, we get the full IUPAC name:
**1-chloro-3,3-dimethylbutane**

### Final Answer
The IUPAC name of `(CH₃)₃C-CH₂CH₂Cl` is **1-chloro-3,3-dimethylbutane**.

---