The IUPAC name of `CH_3 - underset(CH_3)underset(|) CH - underset(OH)underset(|) CH - underset(OH)underset(|) CH - CHO` is

Options

A. 2, 3-Dihydroxy-4-methylpentanal
B. 1-oxo-2, 3-Dihydroxy-4-methylpentane
C. 2,3-Dihydroxy-4-methylpentanone
D. 1, 2-Dihydroxy-3-methylbutanecarbaldehyde

Explanation

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

### Step-by-Step Solution:

1. **Identify the Parent Carbon Chain**:
- First, we need to identify the longest continuous carbon chain in the compound. In this case, we can see that there are five carbon atoms in the chain.
- The structure can be represented as:
```
CH₃ - CH₃
|
CH - OH
|
CH - OH
|
CH - CHO
```
- The longest chain consists of 5 carbon atoms.

2. **Number the Carbon Atoms**:
- We need to number the carbon atoms in the chain, giving priority to the functional groups. The aldehyde (CHO) has the highest priority.
- Numbering from the end closest to the aldehyde:
```
1 - CHO
2 - CH - OH
3 - CH - OH
4 - CH₃
5 - CH₃
```
- This gives us the numbering: 1 (CHO), 2 (OH), 3 (OH), 4 (CH₃), 5 (CH₃).

3. **Identify the Functional Groups and Substituents**:
- We have:
- Aldehyde (CHO) at carbon 1
- Hydroxy (OH) groups at carbon 2 and carbon 3
- Methyl (CH₃) group at carbon 4

4. **Construct the Name**:
- The hydroxy groups are denoted as "hydroxy" in the name, and since there are two of them, we use "dihydroxy".
- The methyl group at carbon 4 is denoted as "4-methyl".
- The parent chain has 5 carbon atoms, which is denoted as "pentane".
- Since the aldehyde is the highest priority functional group, we use the suffix "al".

5. **Combine the Components**:
- Putting it all together, we get:
- "2,3-dihydroxy" for the two hydroxy groups,
- "4-methyl" for the methyl group,
- "pentanal" for the five-carbon chain with an aldehyde.
- Therefore, the complete IUPAC name is **2,3-dihydroxy-4-methylpentanal**.

### Final Answer:
The IUPAC name of the compound is **2,3-dihydroxy-4-methylpentanal**.