The `IUPAC` name of
`CH_(3)-overset(O)overset(||)(C)-CH_(2)-overset(OH)overset(|)(CH)-CHO`
is

Options

A. 5-Oxo-4-hydroxypentan-2-one
B. 4-Hydroxy-5-al-2-pentanone
C. 2-Hydroxy-4-oxopentanal
D. 1-al-4-oxo-pentan-2-ol

Explanation

To determine the IUPAC name of the compound `CH₃-C(=O)-CH₂-CH(OH)-CHO`, we can follow these steps:

### Step 1: Identify the Longest Carbon Chain
The first step is to identify the longest continuous carbon chain in the molecule. In this case, the longest chain consists of five carbon atoms.

### Step 2: Number the Carbon Chain
Next, we need to number the carbon chain. We start numbering from the end of the chain that gives the highest priority functional group the lowest possible number. In this case, the aldehyde group (−CHO) has the highest priority and should be given the lowest number.

1. C1: CHO (aldehyde)
2. C2: CH(OH) (hydroxyl group)
3. C3: CH₂
4. C4: C(=O) (carbonyl group)
5. C5: CH₃

### Step 3: Identify Functional Groups and Their Positions
Now, we identify the functional groups present in the compound:
- An aldehyde group at C1
- A hydroxyl (−OH) group at C2
- A carbonyl (C=O) group at C4

### Step 4: Assign the Correct Prefixes and Suffixes
According to IUPAC nomenclature rules:
- The suffix for an aldehyde is "al".
- The prefix for a hydroxyl group is "hydroxy".
- The longest chain is a pentane since it contains five carbon atoms.

### Step 5: Combine the Information
Now we combine the information:
- The hydroxyl group is on carbon 2, so we will use "2-hydroxy".
- The aldehyde is at the end of the chain, so we will use "pentanal" for the five-carbon chain with an aldehyde.

Putting it all together, we get:
**2-hydroxy-pentanal**

### Final Answer
The IUPAC name of the compound is **2-hydroxy-pentanal**.

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