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MDCAT Chemistry QUESTION #7809
Question 1

Which aldehyde is most reactive toward nucleophilic addition?

  • Acetaldehyde
  • Butyraldehyde
  • Formaldehyde✔️
  • Propionaldehyde
Correct Answer Explanation

Formaldehyde (HCHO) has no alkyl group to donate electrons, so the carbonyl carbon is most electrophilic (least steric hindrance, smallest +I effect).