What is the IUPAC name for the organic compound with structure ?
Answer and explanation
Correct answer: D. 3-methylbutanoic acid
- Step 1: Identify the longest continuous carbon chain containing the carboxyl group: 4 carbons (butanoic acid).
- Step 2: Number the chain starting from the carboxyl carbon as carbon-1: , , , .
- Step 3: The methyl substituent is located on carbon-3, yielding the systematic name 3-methylbutanoic acid.
Answer
3-methylbutanoic acid.
Why not the others: '2-methylbutanoic acid' numbers the chain from the wrong end; 'Pentanoic acid' assumes an unbranched 5-carbon chain; '2-methylpropanoic acid' identifies a 3-carbon parent chain.
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