What is the correct IUPAC name for the compound CH3-CH2-CH(CH3)-COOH?

What is the correct IUPAC name for the compound CH3-CH2-CH(CH3)-COOH?

Step 1: Identify the longest continuous chain of carbon atoms in the compound CH3-CH2-CH(CH3)-COOH.
Step 2: Count the number of carbon atoms in the longest chain. There are 4 carbon atoms.
Step 3: Determine the functional group present. The -COOH group indicates that this is a carboxylic acid.
Step 4: Name the longest chain of 4 carbon atoms. The base name for 4 carbons is 'butanoic acid'.
Step 5: Identify any branches in the carbon chain. There is a methyl group (CH3) attached to the second carbon of the chain.
Step 6: Combine the branch name with the base name. The methyl group is on the second carbon, so we name it '2-methylbutanoic acid'.

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