Which reaction converts ethanal to 3-hydroxybutanal?
Ethanal (CH₃CHO) undergoes aldol condensation with itself, forming 3-hydroxybutanal (CH₃CH(OH)CH₂CHO) before dehydration.
Ref: NCERT Class 12 Chemistry > Chapter 12: Aldehydes, Ketones and Carboxylic Acids > Topic: Physical Properties and Nucleophilic Addition Reactions