Question:
IUPAC name of neohexyl alcohol is
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: May 4, 2026
- 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
To determine the IUPAC name of neohexyl alcohol, we need to understand its structure and the rules for naming alcohols in organic chemistry.
Step-by-step Explanation:
- Identify the neohexyl alcohol structure: Neohexyl refers to an alkyl group characterized by a branching at the alpha (second) carbon atom. The general structure of neohexyl is (CH3)3CCH2-.
- Add the alcohol group to this alkyl structure. Thus, the full structure of neohexyl alcohol becomes (CH3)3CCH2OH.
- Determine the parent chain: The longest carbon chain that includes the OH group is four carbons long. This parent chain is known as 'butane' because it has four carbon atoms.
- Number the carbon atoms in the parent chain: Start numbering from the end closest to the OH group to ensure that the carbon containing the functional group (OH) gets the lowest possible number. Hence, the carbon with the OH group is carbon 1.
- Identify the substituents: At the third carbon of the parent chain, there are two methyl groups attached, giving us 3,3-dimethyl substitution.
- Combine these elements to provide the IUPAC name: Combining the substituents with the parent chain and the alcohol group, the IUPAC name becomes 3,3-Dimethylbutan-1-ol.
Conclusion: The IUPAC name of neohexyl alcohol is 3,3-Dimethylbutan-1-ol.
Incorrect Options Analysis:
- 3,3-Dimethylbutan-2-ol: This implies the OH is on the second carbon, which is not the case here.
- 2,3-Dimethylbutan-1-ol: This suggests a different branching pattern and numbering, not matching neohexyl alcohol.
- 2,3-Dimethylbutan-2-ol: This represents an entirely different structure with alcohol on the second carbon and incorrect substitution.
Hence, the correct answer is 3,3-Dimethylbutan-1-ol.
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