Give the IUPAC name of : `CH_3CH_2C(CH_3)_2CH_2I`

Options

A. 2-Iodo-1-ethyl-2,2-dimethylethane
B. 1-Iodo-2,2-methylbutane
C. 1-Iodo-3,3-dimethylbutane
D. 3-Iodo-2,3-dimethylheptane

Explanation

To determine the IUPAC name of the compound `CH3CH2C(CH3)2CH2I`, we can follow these steps:

### Step 1: Draw the Structure
First, we need to visualize the structure of the compound. The given formula can be broken down as follows:
- Start with `CH3` (methyl group).
- Next is `CH2` (methylene group).
- Then we have a carbon (`C`) that is attached to two methyl groups (`CH3`), which is represented as `C(CH3)2`.
- Finally, there is another `CH2` connected to an iodine atom (`I`).

The structure can be drawn as:
```
CH3
|
CH3-C-CH2-CH2-I
|
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 4 carbon atoms:
```
CH3-CH2-C-CH2
```
This chain is a butane.

### Step 3: Number the Carbon Chain
We need to number the carbon chain in such a way that the substituents (functional groups) receive the lowest possible numbers. The iodine atom is a functional group and should be prioritized in the numbering.

- If we number from left to right:
- 1: CH3
- 2: CH2
- 3: C (with two methyl groups)
- 4: CH2-I

- If we number from right to left:
- 1: CH2-I
- 2: C (with two methyl groups)
- 3: CH2
- 4: CH3

The second numbering gives iodine the lowest number (1), so we will use that.

### Step 4: Identify and Name the Substituents
From the structure:
- At position 1, we have an iodine atom (I).
- At position 2, we have two methyl groups (CH3) attached to the second carbon.

### Step 5: Construct the IUPAC Name
Now we can put together the IUPAC name:
- The iodine substituent is named first, followed by the methyl groups.
- The two methyl groups at position 2 are indicated as "2,2-dimethyl".
- The parent chain is butane.

Putting it all together, the IUPAC name is:
**1-iodo-2,2-dimethylbutane**

### Final Answer
**1-iodo-2,2-dimethylbutane**

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