Provide the proper IUPAC name for PhCH₂CH(CH3)CH₂CH₂CHO. 4-methyl-5-phenylpentanol 4-methyl-5-phenylpentanoic acid 4-methyl-5-phenylpentanone 4-methyl-5-phenylpentanal

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### Determining the IUPAC Name

**Question**: Provide the proper IUPAC name for PhCH₂CH(CH₃)CH₂CH₂CHO.

**Options**:
1. 4-methyl-5-phenylpentanol
2. 4-methyl-5-phenylpentanoic acid
3. 4-methyl-5-phenylpentanone
4. 4-methyl-5-phenylpentanal

In this question, we are asked to determine the correct IUPAC name for the given molecular formula. To solve this, we need to:

1. **Identify the Functional Group**: The given molecule has a formyl group (-CHO) at the end, indicating it is an aldehyde.
2. **Identify the Longest Carbon Chain Containing the Functional Group**: We need to count the longest continuous carbon chain that includes the -CHO group.
3. **Number the Carbon Chain**: The carbon chain should be numbered from the end nearest the highest priority group, which is the aldehyde group in this case.
4. **Identify and Number Substituents**: Identify all substituents on the main chain and assign them numbers based on their position.

**Analysis**:

The correct name should reflect:
- The presence of an aldehyde functional group, denoted by the suffix "-al".
- The phenyl group attached to the 5th carbon.
- The methyl group attached to the 4th carbon.

When named according to IUPAC conventions, the correct name is:

**4-methyl-5-phenylpentanal**.

Thus, the correct option is:

- **Option 4: 4-methyl-5-phenylpentanal**
Transcribed Image Text:### Determining the IUPAC Name **Question**: Provide the proper IUPAC name for PhCH₂CH(CH₃)CH₂CH₂CHO. **Options**: 1. 4-methyl-5-phenylpentanol 2. 4-methyl-5-phenylpentanoic acid 3. 4-methyl-5-phenylpentanone 4. 4-methyl-5-phenylpentanal In this question, we are asked to determine the correct IUPAC name for the given molecular formula. To solve this, we need to: 1. **Identify the Functional Group**: The given molecule has a formyl group (-CHO) at the end, indicating it is an aldehyde. 2. **Identify the Longest Carbon Chain Containing the Functional Group**: We need to count the longest continuous carbon chain that includes the -CHO group. 3. **Number the Carbon Chain**: The carbon chain should be numbered from the end nearest the highest priority group, which is the aldehyde group in this case. 4. **Identify and Number Substituents**: Identify all substituents on the main chain and assign them numbers based on their position. **Analysis**: The correct name should reflect: - The presence of an aldehyde functional group, denoted by the suffix "-al". - The phenyl group attached to the 5th carbon. - The methyl group attached to the 4th carbon. When named according to IUPAC conventions, the correct name is: **4-methyl-5-phenylpentanal**. Thus, the correct option is: - **Option 4: 4-methyl-5-phenylpentanal**
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