The `IUPAC` name of `(CH_(3))_(3) C - CH = CH_(2)` is:

Options

A. 2,2-Dimethylbut-3-ene
B. 2,2-Dimethylpent-4-ene
C. 3,3-Dimethylbut-1-ene
D. Hex-1-ene

Explanation

To find the IUPAC name of the compound `(CH₃)₃C - CH = CH₂`, we can follow these steps:

### Step 1: Identify the Structure
The given compound can be rewritten for clarity:
- It consists of a tert-butyl group `(CH₃)₃C-` attached to a carbon chain with a double bond.

### Step 2: Determine the Longest Carbon Chain
- The longest continuous carbon chain that includes the double bond should be identified. In this case, the longest chain is 4 carbons long, which includes the double bond.

### Step 3: Number the Carbon Chain
- Number the carbon chain starting from the end closest to the double bond to give the lowest possible number to the double bond.
- The numbering will be as follows:
1. The first carbon (C1) is part of the double bond.
2. The second carbon (C2) is also part of the double bond.
3. The third carbon (C3) is the one attached to the tert-butyl group.
4. The fourth carbon (C4) is the last carbon in the chain.

### Step 4: Identify Substituents
- The substituents on the main chain need to be identified. In this case, there are two methyl groups attached to the third carbon.
- Therefore, we have 3,3-dimethyl as the substituent.

### Step 5: Combine the Information
- The main chain is a butene (since it has 4 carbons and a double bond).
- The double bond is located between the first and second carbons, so it is a 1-butene.
- The full name will include the substituents and the main chain.

### Final IUPAC Name
Combining all the information, the IUPAC name of the compound is **3,3-dimethyl-1-butene**.

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