What is the IUPAC name of the following compound: CH₃CH₂COCH₃?
Correct: B
The compound CH₃CH₂COCH₃ contains a carbonyl group (C=O) bonded to two alkyl groups, making it a ketone. The longest carbon chain containing the carbonyl group has four carbons. The carbonyl group is on the second carbon. Therefore, the IUPAC name is butanone.