IUPAC name of `HOOC-CH_(2)-CHO` is

Options

A. Formly ethanoic acid
B. 2-Carboxyethanal
C. Prop-3-al-1-oic acid
D. Prop-1-al-3-oic acid

Answer

To determine the IUPAC name of the compound `HOOC-CH2-CHO`, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Functional Groups**:
The compound contains two functional groups:
- Carboxylic acid (`-COOH`)
- Aldehyde (`-CHO`)

2. **Determine the Parent Chain**:
The longest carbon chain that includes both functional groups should be identified. In this case, the longest chain consists of two carbon atoms.

3. **Assign Priority to Functional Groups**:
According to IUPAC nomenclature rules, carboxylic acids have a higher priority than aldehydes. Therefore, the carboxylic acid group will dictate the suffix of the compound.

4. **Name the Parent Chain**:
The two carbon chain is derived from ethane. Since we have a carboxylic acid, the suffix will be `-oic acid`. Thus, the base name will be "ethanoic acid".

5. **Identify Substituents**:
The aldehyde group (`-CHO`) is treated as a substituent. Since it is on the first carbon of the chain, it is referred to as "formyl".

6. **Combine the Names**:
The full name will combine the substituent and the parent name. The aldehyde is on the first carbon, so we can denote it as "formyl" and combine it with "ethanoic acid".

7. **Final IUPAC Name**:
The final IUPAC name of the compound is **"formyl ethanoic acid"**.