The IUPAC name of
`{:(CH_(3)-C=C--CH-CH_(2)-C-=CH),(" | | |"),(" "Cl" "CH_(3)" "C_(2)H_(5)):}`

Options

A. 6-Chloro-4-ethyl-5-methylhept-5-en-1-yne
B. 6-Chloro-4-ethyl-5-methylhept-1-yn-5-ene
C. 2-Chloro-4-ethyl-3-methylhept-2-ene-6-yne
D. 2-Chloro-4-ethyl-3-methylhept-6-yn-2-ene

Explanation

To determine the IUPAC name of the given compound, we will follow these steps:

### Step 1: Draw the Structure
First, we need to visualize the structure of the compound based on the provided formula. The compound is represented as:
- CH₃-C=C-CH-CH₂-C≡CH
- With substituents: Cl, CH₃, and C₂H₅.

### Step 2: Identify the Longest Carbon Chain
Next, we identify the longest continuous carbon chain. In this case, the longest chain consists of 7 carbon atoms. We can number the chain from right to left to give the lowest possible numbers to the functional groups (double and triple bonds).

### Step 3: Number the Carbon Atoms
Assign numbers to the carbon atoms in the longest chain:
1. C1: CH (triple bond)
2. C2: CH₂
3. C3: CH
4. C4: C=C (double bond)
5. C5: CH₃
6. C6: Cl
7. C7: C₂H₅

### Step 4: Identify Substituents
Now we identify the substituents on the carbon chain:
- C4 has a methyl group (CH₃).
- C6 has a chlorine atom (Cl).
- C5 has an ethyl group (C₂H₅).

### Step 5: Determine the Position of Substituents
- Chlorine is on C6.
- Ethyl is on C4.
- Methyl is on C5.

### Step 6: Construct the Name
According to IUPAC nomenclature:
1. List the substituents in alphabetical order:
- Chloro (C)
- Ethyl (E)
- Methyl (M)

2. Combine the substituents with their positions:
- 6-chloro
- 4-ethyl
- 5-methyl

3. Name the main chain:
- The main chain has 7 carbons, so it is "hept".
- There is a double bond at C4 (5-ene) and a triple bond at C1 (1-yne).

### Final IUPAC Name
Putting it all together, the IUPAC name of the compound is:
**6-chloro-4-ethyl-5-methyl-hept-5-ene-1-yne**