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-hexon-3-yne

Answer

To determine the correct IUPAC name of the compound `CH3-CH2-C≡C-CH=CH2`, we will follow the systematic steps for naming organic compounds with multiple bonds.

### Step-by-Step Solution:

1. **Identify the Longest Carbon Chain**:
- The given structure has a total of 6 carbon atoms. The longest continuous chain of carbon atoms is `CH3-CH2-C≡C-CH=CH2`, which consists of 6 carbon atoms.

2. **Number the Carbon Chain**:
- We need to number the carbon chain in such a way that the multiple bonds (triple and double bonds) receive the lowest possible numbers.
- Starting from the left (C1), the numbering is as follows:
- C1: CH3
- C2: CH2
- C3: C (triple bond)
- C4: C (double bond)
- C5: CH
- C6: CH2
- This gives us the numbering: 1, 2, 3, 4, 5, 6.

3. **Identify the Types of Bonds**:
- In the chain, we have:
- A triple bond between C3 and C4.
- A double bond between C4 and C5.
- According to IUPAC nomenclature, the suffix for a triple bond is “yne” and for a double bond is “ene”.

4. **Determine the Position of the Bonds**:
- The triple bond is located between C3 and C4, so we denote it as "3-yne".
- The double bond is located between C4 and C5, so we denote it as "4-ene".

5. **Combine the Names**:
- According to IUPAC rules, the suffix for the compound should be in alphabetical order. Therefore, “ene” comes before “yne”.
- The parent chain has 6 carbons, which gives the prefix "hex".
- Thus, the complete name is: **Hex-4-ene-3-yne**.

6. **Final IUPAC Name**:
- The correct IUPAC name for the compound `CH3-CH2-C≡C-CH=CH2` is **Hex-4-ene-3-yne**.