Which of the following names are correct for the compound :
`CH_(3)-overset(O)overset(||)(C)-CH_(2)-COOH`

Options

A. 3-ketobutan-1-oic acid
B. 4-Carboxy butan-2-one
C. 3-oxo butan-1-oic acid
D. 3-Carboxy acetone

Answer

To determine the correct IUPAC names for the compound `CH₃-C(=O)-CH₂-COOH`, we need to follow the IUPAC nomenclature rules step by step.

### Step-by-Step Solution:

1. **Identify the Functional Groups**:
The compound contains two functional groups: a carboxylic acid (-COOH) and a ketone (C=O). The carboxylic acid takes precedence over the ketone in naming.

2. **Number the Carbon Chain**:
Start numbering the carbon chain from the end closest to the carboxylic acid group. This gives us:
- C1: COOH
- C2: CH₂
- C3: C=O (ketone)
- C4: CH₃

Thus, the numbering is as follows:
- C1: COOH
- C2: CH₂
- C3: C=O (ketone)
- C4: CH₃

3. **Determine the Parent Chain**:
The longest carbon chain that includes both functional groups is four carbons long, which corresponds to butanoic acid.

4. **Assign the Suffix and Prefix**:
- The suffix for the carboxylic acid is “-oic acid”.
- The ketone can be indicated as “oxo” or “keto”. Here, we will use “oxo” as a prefix.

5. **Combine the Information**:
- The carboxylic acid is at position 1.
- The ketone is at position 3.
Therefore, the correct name is **3-oxo-butanoic acid**.

6. **Check the Other Options**:
- **3-ketobutanoic acid**: This is incorrect because the correct prefix for the ketone is "oxo" when naming alongside a carboxylic acid.
- **4-carboxybutan-2-one**: This is incorrect because the carboxylic acid should be prioritized over the ketone.
- **3-oxo-butan-1-oic acid**: This is correct as it indicates the correct positions of the functional groups.

### Final Answer:
The correct names for the compound are:
- 3-oxo-butanoic acid
- 3-oxo-butan-1-oic acid