IUPAC name of the compound
`CH_(2)=C(CH_(3))_(2)` is

Options

A. 1,1-dimethylprop-2-ene
B. 2-methylprop-1-ene
C. 2-ethyl-3,3-dimethylbutane
D. 2,3-dimethylhexane

Explanation

To determine the IUPAC name of the compound \( CH_2=C(CH_3)_2 \), we will follow the systematic steps for naming organic compounds according to IUPAC rules.

### Step-by-Step Solution:

1. **Identify the Parent Chain**:
- The compound has a double bond (alkene) and branching. The longest continuous chain of carbon atoms that includes the double bond should be identified as the parent chain.
- In this case, the longest chain consists of 3 carbon atoms (propene).

2. **Number the Carbon Atoms**:
- Number the carbon atoms in the chain starting from the end nearest to the double bond to give the double bond the lowest possible number.
- Here, we can number the chain as follows:
- C1: \( CH_2 \) (first carbon)
- C2: \( C \) (second carbon, part of the double bond)
- C3: \( CH_3 \) (third carbon)
- This gives us the numbering: 1 (C1) - 2 (C2) - 3 (C3).

3. **Identify Substituents**:
- There are two methyl groups (\( CH_3 \)) attached to the second carbon (C2).
- Therefore, we have two substituents on the parent chain.

4. **Assign Locants to Substituents**:
- Since both methyl groups are on the second carbon, we denote this as 2,2-dimethyl.

5. **Combine the Name**:
- The base name for a 3-carbon alkene is "propene".
- Since we have a double bond starting at carbon 1, we denote it as "prop-1-ene".
- Combine the substituents with the base name: 2,2-dimethylprop-1-ene.

6. **Final IUPAC Name**:
- The final IUPAC name of the compound \( CH_2=C(CH_3)_2 \) is **2,2-dimethylprop-1-ene**.

### Summary:
The IUPAC name of the compound \( CH_2=C(CH_3)_2 \) is **2,2-dimethylprop-1-ene**.