What is the IUPAC name of `H-overset(overset(O)("||"))(C)-CH_(2)-CH_(2)-OCH_(3)`

Options

A. 2-Formylmethoxyethane
B. Methoxypropanal
C. 2-Methoxypropanal
D. 3-Methoxypropanal

Explanation

To determine the IUPAC name of the compound `H-overset(overset(O)("||"))(C)-CH_(2)-CH_(2)-OCH_(3)`, we will follow these steps:

### Step-by-Step Solution:

1. **Identify the Longest Carbon Chain:**
- The longest continuous carbon chain in the structure is three carbon atoms long, which includes the carbon with the aldehyde group (CHO).

2. **Number the Carbon Chain:**
- Start numbering from the end closest to the functional group. The aldehyde group (CHO) has the highest priority and should be assigned the lowest number. Therefore, we number the chain as follows:
- Carbon 1: CHO (aldehyde)
- Carbon 2: CH2
- Carbon 3: CH2

3. **Identify and Name the Substituents:**
- There is a methoxy group (-OCH3) attached to the third carbon of the chain. This is considered a substituent.

4. **Combine the Names of the Substituents and the Main Chain:**
- The substituent (methoxy) is on the third carbon, so we denote it as "3-methoxy".
- The main chain is a three-carbon chain with an aldehyde, which is named "propanal".

5. **Construct the Full IUPAC Name:**
- Combine the substituent name and the main chain name. The full IUPAC name is:
- **3-methoxypropanal**

### Final Answer:
The IUPAC name of the compound is **3-methoxypropanal**.