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

  1. Propanone
  2. Butanone
  3. Butanal
  4. Butan-1-ol

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The compound is a ketone with 4 carbons. The functional group is on the second carbon, but since "3-butanone" is just "2-butanone" numbered from the other side, it is simply called butanone.
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