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Answer key: Alkanes and cycloalkanes

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Part A: draw the structure

  1. 2-methylbutaneSkeletal structure of 2-methylbutaneCondensed formula: CH₃–CH(CH₃)–CH₂–CH₃
  2. 3-methylpentaneSkeletal structure of 3-methylpentaneCondensed formula: CH₃–CH₂–CH(CH₃)–CH₂–CH₃
  3. methylcyclohexaneSkeletal structure of methylcyclohexane
  4. 1-ethyl-1-methylcyclohexaneSkeletal structure of 1-ethyl-1-methylcyclohexane
  5. 4-ethyl-2-methylhexaneSkeletal structure of 4-ethyl-2-methylhexaneCondensed formula: CH₃–CH(CH₃)–CH₂–CH(CH₂–CH₃)–CH₂–CH₃
  6. (propan-2-yl)cyclohexaneSkeletal structure of (propan-2-yl)cyclohexane
  7. 2,2,3,3-tetramethylbutaneSkeletal structure of 2,2,3,3-tetramethylbutaneCondensed formula: CH₃–C(CH₃)₂–C(CH₃)₂–CH₃
  8. 4-(propan-2-yl)heptaneSkeletal structure of 4-(propan-2-yl)heptaneCondensed formula: CH₃–CH₂–CH₂–CH(CH(CH₃)₂)–CH₂–CH₂–CH₃
  9. 3-ethyl-2,3-dimethylpentaneSkeletal structure of 3-ethyl-2,3-dimethylpentaneCondensed formula: CH₃–CH(CH₃)–C(CH₃)(CH₂–CH₃)–CH₂–CH₃

Part B: name the structure

  1. Skeletal structure of ethylcyclohexaneethylcyclohexane
  2. Skeletal structure of 2,3-dimethylbutane2,3-dimethylbutaneCondensed formula: CH₃–CH(CH₃)–CH(CH₃)–CH₃
  3. Skeletal structure of 2,2,4-trimethylpentane2,2,4-trimethylpentaneCondensed formula: CH₃–C(CH₃)₂–CH₂–CH(CH₃)–CH₃
  4. Skeletal structure of 3-ethylhexane3-ethylhexaneCondensed formula: CH₃–CH₂–CH(CH₂–CH₃)–CH₂–CH₂–CH₃
  5. Skeletal structure of 1,2-dimethylcyclohexane1,2-dimethylcyclohexane
  6. Skeletal structure of 3,3-diethylpentane3,3-diethylpentaneCondensed formula: CH₃–CH₂–C(CH₂–CH₃)₂–CH₂–CH₃
  7. Skeletal structure of 3-ethyl-2,2-dimethylpentane3-ethyl-2,2-dimethylpentaneCondensed formula: CH₃–C(CH₃)₂–CH(CH₂–CH₃)–CH₂–CH₃
  8. Skeletal structure of 1-ethyl-3-methylcyclohexane1-ethyl-3-methylcyclohexane
  9. Skeletal structure of 1,1,3-trimethylcyclohexane1,1,3-trimethylcyclohexane

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