Iupac Nomenclature
Easychemistry
The IUPAC name of CH₃-CH(CH₃)-CH₂-CH₃ is:
Select the correct option:
Solution
Incorrect! Answer:
2-Methylbutane
To name the compound using IUPAC rules:
- Identify Longest Chain: The longest continuous carbon chain has 4 carbons, making the parent alkane Butane.
- Numbering: Number from the end that gives the substituent the lower locant. Starting from the left gives the methyl group at position 2.
- Assemble Name: 2-Methylbutane.
- Common Name: Isopentane.
- Note: Numbering from the right would give 3-methylbutane, which is incorrect according to the lowest locant rule.
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About This Question
- Subject
- chemistry
- Chapter
- some basic principles of organic chemistry
- Topic
- iupac nomenclature
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
2-Methylbutane
To name the compound using IUPAC rules:
- Identify Longest Chain: The longest continuous carbon chain has 4 carbons, making the parent alkane Butane.
- Numbering: Number from the end that gives the substituent the lower locant. Starting from the left gives the methyl group at position 2.
- Assemble Name: 2-Methylbutane.
- Common Name: Isopentane.
- Note: Numbering from the right would give 3-methylbutane, which is incorrect according to the lowest locant rule.
This easy difficulty chemistry question is from the chapter some basic principles of organic chemistry, covering the topic of iupac nomenclature. It appeared in the 2025 exam.
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