The IUPAC name of `CH_3 - overset(OH)overset(|) CH - COOH` is

Options

A. 2-Hydroxypropanoic acid
B. 1-Hydroxypropanoic acid
C. 1-Hydroxyethane carboxylic acid
D. 1-Hydroxyethanoic acid

Explanation

To determine the IUPAC name of the compound `CH3 - OH | CH - COOH`, we will follow the steps outlined in the video transcript.

### Step-by-Step Solution:

1. **Identify the Longest Parent Carbon Chain**:
- Count the number of carbon atoms in the compound. Here, we have a total of 3 carbon atoms.
- The longest carbon chain consists of these 3 carbon atoms.
- The word root for a 3-carbon chain is "propane".

2. **Identify Functional Groups**:
- The compound contains two functional groups: a hydroxyl group (-OH) and a carboxylic acid group (-COOH).
- According to IUPAC nomenclature, the carboxylic acid group has higher priority than the hydroxyl group. Therefore, the -COOH group will dictate the suffix of the compound.

3. **Number the Carbon Atoms**:
- Start numbering the carbon atoms in the parent chain from the end closest to the functional group with the highest priority (the carboxylic acid).
- In this case, the numbering will be as follows:
- Carbon 1: COOH (carboxylic acid)
- Carbon 2: OH (hydroxyl group)
- Carbon 3: CH3 (methyl group)

4. **Assign Substituents and Name the Compound**:
- The hydroxyl group (-OH) on the second carbon is named as "hydroxy".
- Since we have 3 carbon atoms in the main chain, we use "propane" as the base name.
- The carboxylic acid group will be denoted with the suffix "-oic acid".
- Therefore, combining these parts, we get the name: "2-hydroxypropanoic acid".

5. **Final IUPAC Name**:
- The final IUPAC name of the compound is **2-hydroxypropanoic acid**.

### Summary:
The IUPAC name of the compound `CH3 - OH | CH - COOH` is **2-hydroxypropanoic acid**.