Which reaction converts CH₃CH₂CHO to CH₃CH\=CHCHO?
Propanal (CH₃CH₂CHO) undergoes aldol condensation with itself, forming an aldol product that dehydrates to but-2-enal (CH₃CH\=CHCHO).
Ref: NCERT Class 12 Chemistry > Chapter 12: Aldehydes, Ketones and Carboxylic Acids > Topic: Nomenclature, Structure and Preparation of Aldehydes and Ketones