`CH_3CH_2CH_2CH(CH=CH_2)CH_2CH_2CH_3` is

Options

A. 4-Ethenylheptane
B. 3-n-propyl-1-hexene
C. 4-Ethenylhexane
D. 3-Ethenylheptane

Explanation

To determine the IUPAC name of the compound `CH₃CH₂CH₂CH(CH=CH₂)CH₂CH₂CH₃`, we will follow these steps:

### Step 1: Identify the Structure
The given compound can be broken down into its structural components. The compound consists of a straight-chain alkane with a double bond.

### Step 2: Draw the Structure
1. Start with the longest carbon chain. The compound has a total of 7 carbon atoms.
2. The structure can be represented as follows:
- CH₃-CH₂-CH₂-CH(CH=CH₂)-CH₂-CH₂-CH₃

### Step 3: Identify the Longest Carbon Chain
Count the number of carbon atoms in the longest chain, which is 7:
- The longest chain is: CH₃-CH₂-CH₂-CH-CH₂-CH₂-CH₃ (7 carbons)

### Step 4: Number the Carbon Chain
Number the carbon chain starting from the end nearest to the double bond:
1. The numbering from one end would be:
- 1 - CH₃
- 2 - CH₂
- 3 - CH₂
- 4 - CH (with the double bond)
- 5 - CH₂
- 6 - CH₂
- 7 - CH₃

### Step 5: Identify the Position of the Double Bond
The double bond is located between carbon 4 and carbon 5. According to IUPAC nomenclature, we will denote the position of the double bond in the name.

### Step 6: Identify the Substituents
The substituent on carbon 4 is a propyl group (since it is connected to three other carbons):
- The substituent is a propyl group (3 carbon atoms).

### Step 7: Write the IUPAC Name
The IUPAC name is constructed as follows:
- The main chain is heptane (7 carbon atoms).
- The position of the double bond is at carbon 4.
- The substituent is a propyl group at carbon 3.

Thus, the name is:
- 3-Propyl-4-heptene

### Final Answer
The IUPAC name of the compound `CH₃CH₂CH₂CH(CH=CH₂)CH₂CH₂CH₃` is **3-Propyl-4-heptene**.