The correct IUPAC name of
`CH_(3)-CH_(2)-C-=C-CH=CH_(2)`

Options

A. 3-hexyn-5-ene
B. 5-hexen-3-yne
C. 3-hexyn-1-ene
D. 1-hexen-3-yne

Answer

To determine the correct IUPAC name for the compound `CH3-CH2-C≡C-CH=CH2`, we will follow the steps outlined below:

### Step 1: Identify the longest carbon chain
The first step in naming an organic compound is to identify the longest continuous carbon chain. In this case, the longest chain consists of six carbon atoms:
- CH3-CH2-C≡C-CH=CH2

### Step 2: Number the carbon chain
Next, we need to assign numbers to the carbon atoms in the chain. According to IUPAC rules, we should give priority to multiple bonds (double and triple bonds) when numbering. We will start numbering from the end of the chain that gives the lowest numbers to the multiple bonds.

1. Start from the left:
- C1: CH3
- C2: CH2
- C3: C (triple bond)
- C4: C (double bond)
- C5: CH
- C6: CH2

This gives us the following numbering:
- C1: CH3
- C2: CH2
- C3: C≡C
- C4: CH
- C5: CH2

### Step 3: Identify the types and positions of the bonds
From the numbering, we can see:
- There is a triple bond between C3 and C4.
- There is a double bond between C4 and C5.

### Step 4: Assign the correct suffixes
According to the IUPAC nomenclature:
- The longest chain has 6 carbons, which corresponds to "hex".
- The double bond at C4 indicates we will use "en" (for double bonds).
- The triple bond at C3 indicates we will use "yne" (for triple bonds).

### Step 5: Combine the names
The correct way to combine these is to give the double bond priority over the triple bond when naming:
- The compound is named as "hex-3-yne" for the triple bond and "hex-4-ene" for the double bond.

### Final IUPAC Name
Putting it all together, the IUPAC name of the compound is **3-hexyn-1-ene**.