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NEET levelSingle correct optionDifficulty 1 of 3co065

Benzaldehyde reacts with diethyl propanedioate (diethyl malonate) in the presence of a catalytic amount of piperidine (Knoevenagel condensation). The product is

  1. Adiethyl 2-benzylpropanedioate
  2. Bethyl 3-phenylprop-2-enoate
  3. Cdiethyl 2-hydroxy-2-phenylpropanedioate
  4. Ddiethyl 2-benzylidenepropanedioate

Answer: D

The active methylene carbanion adds to and water is eliminated. The product is , diethyl 2-benzylidenepropanedioate.
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