The IUPAC name for
`CH_(3) - undersetunderset(O)("||")C-OH and CH_(3) - undersetunderset(O)("||")C-CH_(3)`

Options

A. 1-Hydroxy-1-oxo ethane, 1-chloro ethanal
B. 1-Hydroxy ethanal, acetoyl chloride
C. 1-Oxoethanamine, ethanoyl chloride
D. Ethanoic acid, propan-2-one

Answer

To determine the IUPAC names for the given compounds, we will follow a systematic approach.

### Step 1: Identify the longest carbon chain
For the first compound, `CH₃ - C(=O) - OH`, we can see that there are two carbon atoms in the longest chain. For the second compound, `CH₃ - C(=O) - CH₃`, there are three carbon atoms in the longest chain.

### Step 2: Determine the parent hydrocarbon name
- For the first compound with 2 carbon atoms, the parent hydrocarbon is **ethane**.
- For the second compound with 3 carbon atoms, the parent hydrocarbon is **propane**.

### Step 3: Identify the functional groups
- The first compound has a **carboxylic acid** functional group (–COOH), which is named as **-oic acid**.
- The second compound has a **ketone** functional group (C=O), which is named as **-one**.

### Step 4: Combine the parent name with the functional group
- For the first compound, since it has 2 carbon atoms and a carboxylic acid, we replace the "e" in ethane with "oic acid" to get **ethanoic acid**.
- For the second compound, since it has 3 carbon atoms and a ketone, we replace the "e" in propane with "one" to get **propanone**.

### Step 5: Specify the position of the functional group if necessary
- In the first compound, the carboxylic acid is at the first carbon, but we do not need to specify the position as it is implied. Thus, it is simply **ethanoic acid**.
- In the second compound, the ketone is at the second carbon, so we can specify it as **2-propanone**.

### Final IUPAC Names
- The IUPAC name for the first compound is **ethanoic acid**.
- The IUPAC name for the second compound is **2-propanone**.

### Summary of IUPAC Names:
1. **Ethanoic acid** for `CH₃ - C(=O) - OH`
2. **2-Propanone** for `CH₃ - C(=O) - CH₃`

---