The IUPAC name of the compound having formula
`H_(3)C-underset(CH_(3))underset(|)overset(CH_(2)CH_(3))overset(|)(C)-CH=CH_(2)` is

Options

A. 3,3,3-trimethylprop-1-ene
B. 1,1,1-trimethylprop-2-ene
C. 3,3-dimethylpent-1-ene
D. 2,2-dimethylbut-3-ene.

Explanation

To determine the IUPAC name of the compound with the formula `H₃C-CH(CH₃)-C(CH₂CH₃)=C-CH₂`, we will follow these steps:

### Step 1: Draw the Structure
First, we need to visualize the structure based on the provided formula. The structure can be represented as:
```
CH3
|
CH3-C-CH=CH2
|
CH2CH3
```

### 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 5 carbon atoms:
```
1. CH2 (C1)
2. CH (C2)
3. CH (C3)
4. CH (C4)
5. CH2 (C5)
```
This gives us a parent chain of 5 carbons.

### Step 3: Number the Carbon Chain
We will number the carbon chain from the end closest to the double bond to give the double bond the lowest possible number. Thus, we number the chain as follows:
```
1. C1 - CH2
2. C2 - CH
3. C3 - CH
4. C4 - CH
5. C5 - CH2
```
The double bond is between C3 and C4.

### Step 4: Identify and Name the Substituents
Now, we need to identify the substituents attached to the main carbon chain.
- There are two methyl groups (CH₃) attached to C3.
- There is one ethyl group (CH₂CH₃) attached to C2.

### Step 5: Write the IUPAC Name
Now we can write the IUPAC name based on the information we gathered:
1. The longest chain is pentane (5 carbons).
2. The double bond is at C1, so we use "pent-1-ene."
3. There are two methyl groups at C3, so we write "3,3-dimethyl."

Putting it all together, the IUPAC name of the compound is:
**3,3-dimethylpent-1-ene**

### Final Answer
The IUPAC name of the compound is **3,3-dimethylpent-1-ene**.