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What is the IUPAC name of the compound shown?

  1. A4-hydroxybutan-2-one
  2. B4-hydroxybutanal
  3. C1-hydroxybutan-3-one
  4. D3-oxobutan-1-ol

Answer: A

The compound is 4-hydroxybutan-2-one. Ketone outranks alcohol, so the ketone supplies the suffix -one and gets the lowest locant (2); the OH is the prefix hydroxy at C4.
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