MolSynapsequestion bank
MolSynapse / Question bank / Aldehydes, Ketones and Carboxylic Acids / Aldol, Cannizzaro, Perkin, Claisen and related condensations
JEE Main levelSingle correct optionDifficulty 2 of 3co073

Benzaldehyde (1 mol) is added to excess propanone with dilute NaOH and warmed until dehydration is complete (Claisen-Schmidt condensation). The main product is

  1. A1,5-diphenylpenta-1,4-dien-3-one
  2. B4-phenylbutan-2-one
  3. C3-phenylbut-3-en-2-one
  4. D4-phenylbut-3-en-2-one

Answer: D

The enolate of propanone attacks benzaldehyde, which has no alpha-hydrogen. Dehydration gives , 4-phenylbut-3-en-2-one. Excess propanone prevents the second condensation that gives the dibenzylidene product.
Practice Aldehydes, Ketones and Carboxylic Acids More on Aldol, Cannizzaro, Perkin, Claisen and related condensations
Previous questionNext question

More questions on Aldol, Cannizzaro, Perkin, Claisen and related condensations