Which of the following is the correct IUPAC name for the compound with the structure CH3-CH2-CH(CH3)-COOH?

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Q: Which of the following is the correct IUPAC name for the compound with the structure CH3-CH2-CH(CH3)-COOH?

Solution: The longest chain has four carbons with a methyl group on the second carbon, hence it is named 2-Methylbutanoic acid.

Steps: 5

Step 1: Identify the longest continuous chain of carbon atoms in the structure CH3-CH2-CH(CH3)-COOH. Count the number of carbons in this chain.
Step 2: The longest chain has 4 carbon atoms, which means it is a butanoic acid because 'but' indicates 4 carbons.
Step 3: Look for any branches (substituents) on the main chain. In this case, there is a methyl group (CH3) attached to the second carbon of the main chain.
Step 4: Since the methyl group is on the second carbon, we name it 2-Methyl.
Step 5: Combine the branch name with the name of the main chain. The full name is 2-Methylbutanoic acid.