What is the systematic IUPAC name for the branched hydrocarbon with structural formula (CH₃)₂CH-CH₂-CH(CH₃)₂?
Answer and explanation
Correct answer: B. 2,4-dimethylpentane
- Step 1: Identify the longest carbon chain: 5 carbon atoms (pentane). Step 2. Number the chain from either end: methyl branches are at positions C-2 and C-4. Step 3. Combine with prefix: 2,4-dimethylpentane. Answer: 2,4-dimethylpentane. Why not the others: Hexane has 6 carbons in the parent chain; 2,2-dimethylpentane has both methyl groups on carbon 2; tetramethylpropane is non-systematic.
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