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

Answer

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

### Step 1: Identify the longest carbon chain
The given structure can be represented as:
```
CH3
|
CH3 - C - CH = CH2
|
CH3
```
The longest continuous carbon chain that includes the double bond consists of 4 carbon atoms.

### Step 2: 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.
- Starting from the left, the numbering is as follows:
1. CH₃ (C1)
2. C (C2)
3. CH (C3)
4. CH₂ (C4)

### Step 3: Identify substituents
In this structure, we have two methyl groups attached to the second carbon (C2).

### Step 4: Determine the position of the double bond
The double bond is between C3 and C4. According to IUPAC nomenclature, we indicate the position of the double bond by the number of the first carbon involved in the double bond. Here, the double bond starts at C3.

### Step 5: Combine the information to write the name
The substituents and their positions are:
- 2,2-dimethyl (two methyl groups on C2)
- The main chain is a butene (since there are 4 carbons and a double bond).

Thus, the complete IUPAC name is:
**2,2-dimethylbut-2-ene**

### Final Answer
The IUPAC name of `(CH₃)₃C-CH=CH₂` is **2,2-dimethylbut-2-ene**.

---