The correct representation of 4-hydroxy-2-methylpent-2-en-1-al is

Options

A. `CH_(3)-underset(OH)underset(|)(C)H-CH=underset(CH_(3))underset(|)(C)-CHO`
B. `CH_(3)-underset(CH_(3))underset(|)(C)H-CH=underset(OH)underset(|)(C)-CHO`
C. `CH_(3)-underset(OH)underset(|)overset(CH_(3))overset(|)(C)-CH=underset(CH_(3))underset(|)(C)-CHO`
D. `CH_(3)-underset(OH)underset(|)(C)H-CH_(2)-underset(CH_(3))underset(|)(C)H-CHO`

Explanation

To determine the correct representation of 4-hydroxy-2-methylpent-2-en-1-al, we will break down the name step by step and construct the molecular structure accordingly.

### Step-by-Step Solution:

1. **Identify the main chain:**
- The name indicates "pent," which means the main carbon chain consists of 5 carbon atoms.
- Therefore, we will draw a straight chain of 5 carbon atoms.

2. **Determine the functional groups:**
- The suffix "al" indicates the presence of an aldehyde group (-CHO) at the end of the carbon chain. This means that the carbon at position 1 will have the aldehyde functional group.
- The "hydroxy" part indicates the presence of an -OH (hydroxyl) group.

3. **Locate the double bond:**
- The "2-en" in the name indicates that there is a double bond starting at the second carbon. Therefore, we will place a double bond between the second and third carbon atoms.

4. **Add substituents:**
- The "2-methyl" indicates that there is a methyl group (CH₃) attached to the second carbon.
- The "4-hydroxy" indicates that there is a hydroxyl group (-OH) attached to the fourth carbon.

5. **Construct the complete structure:**
- Now, we will combine all the information:
- Start with a 5-carbon chain: C1-C2-C3-C4-C5.
- Place the aldehyde group on C1.
- Add the double bond between C2 and C3.
- Attach the methyl group (CH₃) to C2.
- Attach the hydroxyl group (-OH) to C4.

6. **Final structure:**
- The final structure can be represented as follows:
```
CH3
|
H2C=C
|
CH
|
CH2
|
C=O
|
H
```
- This structure corresponds to 4-hydroxy-2-methylpent-2-en-1-al.