The IUPAC name of `(CH_(3))_(2) CHCH_(3)` is

Options

A. Dimethylethane
B. Trimethylmethane
C. Isopropylmethane
D. 2-Methylpropane

Explanation

To determine the IUPAC name of the compound `(CH₃)₂CHCH₃`, we can follow these steps:

### Step 1: Draw the Structure
First, we need to visualize the structure of the compound. The molecular formula `(CH₃)₂CHCH₃` indicates that we have:
- Two methyl groups (CH₃) attached to a carbon (C).
- One more methyl group attached to another carbon.

This gives us the following structure:
```
CH₃
|
CH₃-C-CH₃
```

### Step 2: Identify the Longest Carbon Chain
Next, we need to identify the longest continuous carbon chain in the structure. In this case, the longest chain consists of three carbon atoms:
```
CH₃-CH-CH₃
```

### Step 3: Number the Carbon Chain
We will number the carbon chain starting from one end to the other. We can start from either end since it will yield the same numbering:
1. First carbon (C1)
2. Second carbon (C2)
3. Third carbon (C3)

### Step 4: Identify Substituents
Now, we need to identify the substituents on the carbon chain. We see that there is a methyl group attached to the second carbon (C2):
```
CH₃
|
CH₃-C-CH₃
```
So, we have a methyl group at position 2.

### Step 5: Write the IUPAC Name
Now we can combine the information:
- The longest carbon chain has 3 carbons, which corresponds to the root name "prop."
- Since there is a methyl substituent at the second position, we will prefix "2-methyl" to the root name.

Thus, the IUPAC name of the compound is **2-methylpropane**.

### Final Answer
The IUPAC name of `(CH₃)₂CHCH₃` is **2-methylpropane**.

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