Question:
What is the IUPAC name of the compound \( \text{CH}_3\text{CH}_2\text{COCH}_2\text{CH}_3 \)?
What is the IUPAC name of the compound \( \text{CH}_3\text{CH}_2\text{COCH}_2\text{CH}_3 \)?
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\textbf{Key Fact:} In IUPAC nomenclature for ketones, the carbonyl group gets the lowest possible number in the longest carbon chain.
Updated On: May 26, 2025
- Pentan-3-one
- Butan-2-one
- Pentan-2-one
- Hexan-3-one
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The Correct Option is A
Solution and Explanation
- Identify the Structure: The compound CH3CH2COCH2CH3 has the structure CH3-CH2-C(=O)-CH2-CH3.
- Count Carbon Atoms: The longest chain containing the carbonyl group has 5 carbons: C-C-C(=O)-C-C, so the base name is pentane.
- Identify Functional Group: The carbonyl group (C=O) indicates a ketone, so the suffix is "-one."
- Number the Chain: Number the chain to give the carbonyl group the lowest possible number: CH3(5)-CH2(4)-C(=O)(3)-CH2(2)-CH3(1). The carbonyl is at position 3.
- Name the Compound: The IUPAC name is pentan-3-one.
- Conclusion: The correct answer is (1) Pentan-3-one.
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