What is the IUPAC systematic name for the organic compound with molecular structure ?
Answer and explanation
Correct answer: B. Butan-2-one
- Step 1: Identify the principal functional group: A carbonyl group () bonded to two alkyl carbons indicates an aliphatic ketone.
- Step 2: Determine the carbon chain length: carbons in a continuous chain yields the root 'butan-'.
- Step 3: Number the carbon chain from the end closer to the carbonyl carbon: Carbon-2 carries the carbonyl, yielding 'butan-2-one'.
Answer
Butan-2-one.
Why not the others: 'Butanal' is an aldehyde with carbonyl on a terminal carbon; 'Butan-1-ol' is an alcohol containing a hydroxyl group; 'Ethanoic acid' is a two-carbon carboxylic acid.
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