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What is the correct IUPAC name for CH;-ċ-CH,CHCH; O 2-methyl-2-pentanone 2-methyl-4-pentanone O 4-methyl-2-pentanone O 2-methyl-4-pentanal

What is the correct IUPAC name for CH;-ċ-CH,CHCH; O 2-methyl-2-pentanone 2-methyl-4-pentanone O 4-methyl-2-pentanone O 2-methyl-4-pentanal

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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**Question: What is the correct IUPAC name for the following compound?** **Structure:** The compound features a five-carbon chain with a carbonyl (C=O) group on the second carbon. On the same carbonyl group, there is a methyl (CH₃) group attached to the second carbon. The structure appears as follows: CH₃-C(=O)-CH₂-CH(CH₃)₂ **Options:** - A) 2-methyl-2-pentanone - B) 2-methyl-4-pentanone - C) 4-methyl-2-pentanone - D) 2-methyl-4-pentanal The correct answer is: **2-methyl-2-pentanone** **Explanation:** The central structure for consideration is a five-carbon chain (pentane) with a ketone functional group (carbonyl group) at the second carbon. Since there is also a methyl group on the second carbon, the full IUPAC name is **2-methyl-2-pentanone**. We prioritize the carbon chain (longest chain) and its functional groups following IUPAC nomenclature rules to assign the correct name. The carbonyl group is given the lowest possible number, which makes it clear that: - The base name is pentanone because there are five carbons. - The carbonyl group is at the second position, not the fourth. - The methyl substituent is also at the second position. Thus, the only accurate name among the given options is **2-methyl-2-pentanone.**
Transcribed Image Text:**Question: What is the correct IUPAC name for the following compound?** **Structure:** The compound features a five-carbon chain with a carbonyl (C=O) group on the second carbon. On the same carbonyl group, there is a methyl (CH₃) group attached to the second carbon. The structure appears as follows: CH₃-C(=O)-CH₂-CH(CH₃)₂ **Options:** - A) 2-methyl-2-pentanone - B) 2-methyl-4-pentanone - C) 4-methyl-2-pentanone - D) 2-methyl-4-pentanal The correct answer is: **2-methyl-2-pentanone** **Explanation:** The central structure for consideration is a five-carbon chain (pentane) with a ketone functional group (carbonyl group) at the second carbon. Since there is also a methyl group on the second carbon, the full IUPAC name is **2-methyl-2-pentanone**. We prioritize the carbon chain (longest chain) and its functional groups following IUPAC nomenclature rules to assign the correct name. The carbonyl group is given the lowest possible number, which makes it clear that: - The base name is pentanone because there are five carbons. - The carbonyl group is at the second position, not the fourth. - The methyl substituent is also at the second position. Thus, the only accurate name among the given options is **2-methyl-2-pentanone.**
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