The synthesis of crotonaldehyde from acetaldehyde is an example of $\ldots \ldots .$ reaction,

• A

  nucleophilic addition
• B

  elimination
• C

  electrophilic addition
• Correct answer
  D

  nucleophilic addition-elimination

Solution

Crotonaldehyde is produced by the aldol condensation of acetaldehyde.

Hence, the correct answer is option: 'D'.