Lesson eLearning

Name the following compound according to IUPAC nomenclature: CH₃‑CH₂‑C(O)‑CH₃.

easy 1 mark Class 12 · Chemistry · Aldehydes Ketones and Carboxylic Acids
Answer
Butan-2-one

The correct answer is Butan-2-one — Combine the parent name "butane" (four carbons) with the suffix to obtain "butan-2-one".

Step-by-step solution

  1. Identify the longest carbon chain containing the carbonyl group; it has four carbon atoms.
  2. Number the chain so that the carbonyl carbon gets the lowest possible locant; numbering from the left gives the carbonyl at carbon 2.
  3. Since the functional group is a ketone, use the suffix "‑one" and indicate the position of the carbonyl as "2".
  4. Combine the parent name "butane" (four carbons) with the suffix to obtain "butan-2-one".
Common mistake: Assigning the carbonyl carbon a higher number instead of the lowest possible.

Concept tested: Nomenclature of ketones

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