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Answer key: Carboxylic acids and derivatives

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Part A: draw the structure

  1. propanoic acidSkeletal structure of propanoic acidCondensed formula: CH₃–CH₂–COOH
  2. ethanoic acidSkeletal structure of ethanoic acidCondensed formula: CH₃–COOH
  3. methyl ethanoateSkeletal structure of methyl ethanoateCondensed formula: CH₃–COO–CH₃
  4. methyl propanoateSkeletal structure of methyl propanoateCondensed formula: CH₃–CH₂–COO–CH₃
  5. 2-methylpropanoic acidSkeletal structure of 2-methylpropanoic acidCondensed formula: CH₃–CH(CH₃)–COOH
  6. ethanoyl chlorideSkeletal structure of ethanoyl chlorideCondensed formula: CH₃–COCl
  7. cyclohexanecarboxylic acidSkeletal structure of cyclohexanecarboxylic acid
  8. butanedioic acidSkeletal structure of butanedioic acidCondensed formula: HOOC–CH₂–CH₂–COOH
  9. methyl 2-methylpropanoateSkeletal structure of methyl 2-methylpropanoateCondensed formula: CH₃–CH(CH₃)–COO–CH₃
  10. 3-oxobutanoic acidSkeletal structure of 3-oxobutanoic acidCondensed formula: CH₃–CO–CH₂–COOH

Part B: name the structure

  1. Skeletal structure of ethyl ethanoateethyl ethanoateCondensed formula: CH₃–COO–CH₂–CH₃
  2. Skeletal structure of butanoic acidbutanoic acidCondensed formula: CH₃–CH₂–CH₂–COOH
  3. Skeletal structure of ethanamideethanamideCondensed formula: CH₃–CONH₂
  4. Skeletal structure of propanoyl chloridepropanoyl chlorideCondensed formula: CH₃–CH₂–COCl
  5. Skeletal structure of propyl ethanoatepropyl ethanoateCondensed formula: CH₃–COO–CH₂–CH₂–CH₃
  6. Skeletal structure of N-methylpropanamideN-methylpropanamideCondensed formula: CH₃–CH₂–CO–NH–CH₃
  7. Skeletal structure of N,N-dimethylethanamideN,N-dimethylethanamideCondensed formula: CH₃–CO–N(CH₃)₂
  8. Skeletal structure of propanedioic acidpropanedioic acidCondensed formula: HOOC–CH₂–COOH
  9. Skeletal structure of prop-2-enoic acidprop-2-enoic acidCondensed formula: CH₂=CH–COOH

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