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Answer key: Alkenes and alkynes

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Part A: draw the structure

  1. but-1-eneSkeletal structure of but-1-eneCondensed formula: CH₂=CH–CH₂–CH₃
  2. but-2-yneSkeletal structure of but-2-yneCondensed formula: CH₃–C≡C–CH₃
  3. buta-1,3-dieneSkeletal structure of buta-1,3-dieneCondensed formula: CH₂=CH–CH=CH₂
  4. 2-methylbuta-1,3-dieneSkeletal structure of 2-methylbuta-1,3-dieneCondensed formula: CH₂=C(CH₃)–CH=CH₂
  5. 4-methylpent-2-yneSkeletal structure of 4-methylpent-2-yneCondensed formula: CH₃–C≡C–CH(CH₃)–CH₃
  6. 1-methylcyclohex-1-eneSkeletal structure of 1-methylcyclohex-1-ene
  7. 3,3-dimethylbut-1-yneSkeletal structure of 3,3-dimethylbut-1-yneCondensed formula: CH≡C–C(CH₃)₂–CH₃
  8. 3,3-dimethylcyclohex-1-eneSkeletal structure of 3,3-dimethylcyclohex-1-ene
  9. 2-methylhex-1-en-3-yneSkeletal structure of 2-methylhex-1-en-3-yneCondensed formula: CH₂=C(CH₃)–C≡C–CH₂–CH₃

Part B: name the structure

  1. Skeletal structure of pent-1-ynepent-1-yneCondensed formula: CH≡C–CH₂–CH₂–CH₃
  2. Skeletal structure of cyclohexenecyclohexene
  3. Skeletal structure of 2-methylbut-2-ene2-methylbut-2-eneCondensed formula: CH₃–C(CH₃)=CH–CH₃
  4. Skeletal structure of 2,3-dimethylbut-2-ene2,3-dimethylbut-2-eneCondensed formula: CH₃–C(CH₃)=C(CH₃)–CH₃
  5. Skeletal structure of hexa-1,5-dienehexa-1,5-dieneCondensed formula: CH₂=CH–CH₂–CH₂–CH=CH₂
  6. Skeletal structure of 3-ethylpent-2-ene3-ethylpent-2-eneCondensed formula: CH₃–CH=C(CH₂–CH₃)–CH₂–CH₃
  7. Skeletal structure of pent-1-en-4-ynepent-1-en-4-yneCondensed formula: CH₂=CH–CH₂–C≡CH
  8. Skeletal structure of 3-methylcyclohex-1-ene3-methylcyclohex-1-ene
  9. Skeletal structure of 1,3-dimethylcyclohex-1-ene1,3-dimethylcyclohex-1-ene

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