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What is the IUPAC name of CH3-CO-CH2-CH2-CH3?

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in Chemistry – Class 12 by (188k points)
What is the IUPAC name of CH3-CO-CH2-CH2-CH3?

(a) Butan-1-one

(b) Butan-2-one

(c) Pentan-1-one

(d) Pentan-2-one

The question was posed to me in exam.

Query is from Nomenclature and Structure of Carbonyl Groups in portion Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

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The correct answer is (d) Pentan-2-one

The explanation: The carbon of the CO ketonic group should be included in the parent chain, and the numbering starts from the end nearer to the carbonyl group. Hence in the given compound, there are five carbon atoms in the parent chain and the carbonyl carbon is second one.

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