The IUPAC name of the compound having the formula is
`H_3C-underset(CH_3)underset(|)overset(CH_3)overset(|)C-CH=CH_2`

Options

A. 3,3,3 - Trimethyl -1-propene
B. 1,1,1 - Trimethyl -2-propene
C. 3,3 - Dimethyl -1-butene
D. 2,2-Dimethyl -3-butene

Answer

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

### Step 1: Identify the Longest Carbon Chain
First, we need to identify the longest continuous carbon chain in the compound. The structure can be visualized as follows:

```
CH3
|
CH3 - C - C = CH2
```

In this structure, the longest carbon chain contains 4 carbon atoms.

### Step 2: Number the Carbon Chain
Next, we need to number the carbon chain. We will number the chain from the end closest to the double bond to give it the lowest possible number.

```
1 2 3 4
CH3 - C - C = CH2
```

### Step 3: Identify Substituents
Now, we need to identify any substituents on the carbon chain. In this case, there are two methyl (CH3) groups attached to carbon 3.

### Step 4: Determine the Double Bond Location
The double bond is located between carbon 2 and carbon 3.

### Step 5: Construct the Name
Now we can construct the IUPAC name. The substituents are indicated first, followed by the name of the main chain. The substituents are named in alphabetical order, and we include their positions.

- The substituents: 3,3-dimethyl
- The main chain: butene (since there are 4 carbons and a double bond)

Putting it all together, the IUPAC name is:
**3,3-dimethylbut-2-ene**

### Final Answer:
The IUPAC name of the compound is **3,3-dimethylbut-2-ene**.

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