Question:

IUPAC name of neohexyl alcohol is

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- Longest carbon chain should include the hydroxyl (-OH) group.
- Numbering starts from the end closest to -OH.
- Use lowest possible numbers for substituents and functional groups.
- Alphabetize substituents in the name when necessary.
Updated On: Mar 18, 2025
  • 3,3-Dimethylbutan-2-ol
  • 3,3-Dimethylbutan-1-ol
  • 2,3-Dimethylbutan-1-ol
  • 2,3-Dimethylbutan-2-ol
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The Correct Option is B

Solution and Explanation

Step 1: Understanding the Structure of Neohexyl Alcohol 
- Neohexyl alcohol consists of a six-carbon chain with a hydroxyl (-OH) group. 
- The longest continuous chain is butane (4 carbons), and substituents are added accordingly. 
- It has two methyl (-CH$_3$) groups on the third carbon and a hydroxyl (-OH) functional group on the first carbon. 

Step 2: IUPAC Naming Rules 1. Identify the longest carbon chain containing the -OH group → Butane (4 carbons). 
2. Number the chain from the end closest to the -OH group → -OH is on Carbon 1. 
3. Identify and name substituents → Two methyl groups (-CH$_3$) at Carbon 3. 
4. Arrange in alphabetical order and use lowest locants → 3,3-Dimethylbutan-1-ol. 
Step 3: Verifying the Answer - The correct name based on IUPAC rules is 3,3-Dimethylbutan-1-ol, which matches Option (2).

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