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JEE Main levelOne or more correct optionsDifficulty 2 of 3co087

Ethyl ethanoate undergoes Claisen condensation with sodium ethoxide in ethanol. Which statements are correct? (One or more answers)

  1. AAt least one full equivalent of ethoxide is needed.
  2. BThe product is ethyl 3-oxobutanoate.
  3. CAqueous NaOH can replace sodium ethoxide with the same product.
  4. DDeprotonation of the beta-keto ester product drives the equilibrium forward.

Answer: A, B, D

The condensation equilibrium is unfavourable until the acidic beta-keto ester (pKa about 11) is deprotonated by ethoxide, consuming a full equivalent of base. The product is . Aqueous NaOH would saponify the ester instead, so statement 3 is false.
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