Question:
The IUPAC name of $\text{CH}_3\text{-CH}_2\text{-CH(CH}_3\text{)-CH}_3$ is}
The IUPAC name of $\text{CH}_3\text{-CH}_2\text{-CH(CH}_3\text{)-CH}_3$ is}
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Always identify the longest carbon chain and number any substituents from that chain, ensuring the lowest numbers are used for correct nomenclature.
Updated On: May 31, 2026
- 2-Methylbutane
- Isopentane
- Pentane
- 3-Methylbutane
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The Correct Option is A
Solution and Explanation
Step 1: Concept
In IUPAC nomenclature, the longest carbon chain is chosen as the parent compound. Then, substituents are identified and their positions are numbered to give the lowest possible numbers to the substituents.
Step 2: Meaning
The given structure $\text{CH}_3\text{-CH}_2\text{-CH(CH}_3\text{)-CH}_3$ has a four-carbon chain with one methyl group attached to the second carbon atom. The task is to name this compound according to IUPAC rules.
Step 3: Analysis
1. Identify the longest continuous carbon chain: This chain contains 4 carbons, making it a butane. 2. Identify substituents and their positions: - A methyl group ($\text{CH}_3$) is attached to the second carbon atom of the four-carbon chain. Thus, the name should be "2-methylbutane" because the substituent (methyl group) is on the second carbon of a butane chain. Option B (Isopentane) and Option C (Pentane) are incorrect as they do not match the structure. Isopentane has a five-carbon chain with two methyl groups, while pentane is a straight-chain alkane without any substituents. Option D (3-Methylbutane) would be correct if the methyl group were attached to the third carbon atom of the butane chain, which it is not in this case.
Step 4: Conclusion
The IUPAC name for $\text{CH}_3\text{-CH}_2\text{-CH(CH}_3\text{)-CH}_3$ is 2-methylbutane as it follows the IUPAC rules correctly by numbering the substituent to give the lowest possible number. Final Answer: (A)
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