a. 2,5,5-trimethyl-3-hexanone
- Main chain: Hexane (6 carbons)
- Functional group: Ketone (carbonyl group at position 3)
- Substituents: Methyl groups at positions 2, 5, and 5
b. 2,3-dimethylbutanoic acid
- Main chain: Butanoic acid (4 carbons with a carboxylic
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