Write IUPAC names of the following compounds :
`CH_(3)-underset(CHO)underset(|)(CH)-CH_(2)-CH_(3)`

Answer

To write the IUPAC name of the compound `CH₃-CHO-CH(CH₃)-CH₂-CH₃`, we will follow these steps:

### Step-by-Step Solution:

1. **Identify the Functional Group**:
The compound contains a functional group, which is the aldehyde group (CHO). Aldehydes have the general formula R-CHO.

2. **Determine the Longest Carbon Chain**:
Count the number of carbon atoms in the longest continuous chain that includes the functional group. In this case, the longest chain consists of 5 carbon atoms.

3. **Number the Carbon Chain**:
Start numbering from the end of the chain closest to the functional group (CHO). This ensures that the functional group receives the lowest possible number. The numbering will be as follows:
- C1: CHO (aldehyde)
- C2: CH (attached to CH₃)
- C3: CH₂
- C4: CH₂
- C5: CH₃

4. **Identify Substituents**:
In this compound, there is a methyl (CH₃) group attached to the second carbon.

5. **Construct the IUPAC Name**:
The base name for a 5-carbon aldehyde is "pentanal". Since there is a methyl group on the second carbon, we denote this as "2-methyl". Therefore, the full IUPAC name is:
- **2-methylpentanal**

### Final Answer:
The IUPAC name of the compound `CH₃-CHO-CH(CH₃)-CH₂-CH₃` is **2-methylpentanal**.