The IUPAC name of the compound is :-
`H -= C - CH_(2) - CH_(2) -oversetoverset(CH_(2)=CH)(|)C=CH - oversetoverset(H)(|)C=O`

Options

A. 3-(1-butynl) -2,4-pentadienal
B. 5-Ethynyl -3-vinyl -2-pentenal
C. 3-vinyl -2-hepten-6-ynal
D. 5-Acetyl -3-ethenyl-2-pentanal

Answer

To determine the IUPAC name of the given compound, we will follow a systematic approach:

### Step-by-Step Solution:

1. **Identify the Structure**:
The compound has a chain with multiple functional groups including a double bond (alkene), a triple bond (alkyne), and an aldehyde group (–CHO).

2. **Determine the Longest Carbon Chain**:
We need to find the longest continuous chain of carbon atoms that includes the highest priority functional group. In this case, the longest chain consists of 7 carbon atoms.

3. **Number the Carbon Chain**:
We will number the carbon chain starting from the end nearest to the highest priority functional group, which is the aldehyde. This ensures that the aldehyde gets the lowest possible number.

- The numbering will be as follows:
- C1: CHO (aldehyde)
- C2: C=C (double bond)
- C3: C≡C (triple bond)
- C4: CH2
- C5: CH2
- C6: CH
- C7: CH2

4. **Identify and Name the Substituents**:
The compound has a vinyl group (–CH=CH2) as a substituent on the third carbon.

5. **Assign Locants to Functional Groups**:
- The aldehyde is on carbon 1.
- The double bond is between carbons 2 and 3.
- The triple bond is on carbon 6.
- The vinyl group is on carbon 3.

6. **Construct the Name**:
According to IUPAC rules, we will list the substituents in alphabetical order, followed by the main chain name. The main chain is a heptene due to the presence of a double bond, and we will indicate the positions of the double and triple bonds.

- The name will be structured as follows:
- The vinyl group on carbon 3 is named first.
- The double bond is indicated as "2-heptene".
- The triple bond is indicated as "6-yne".
- The aldehyde suffix is "al".

Thus, the full name is: **3-Vinyl-2-hepten-6-yne-1-al**.

### Final IUPAC Name:
**3-Vinyl-2-hepten-6-yne-1-al**

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