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NEET levelSingle correct optionDifficulty 1 of 3co060

Ethyl ethanoate is treated with one equivalent of sodium ethoxide in ethanol and then acidified. The Claisen condensation product is

Aethyl 3-hydroxybutanoate
Bethyl 3-oxobutanoate
Cethyl but-2-enoate
Dbutane-2,3-dione

Answer: B

The ester enolate

X_{-} X_{2}^{2 -} CH X_{2} COOEt

attacks the ester carbonyl of a second molecule and ethoxide is lost. The product is

CH X_{3} COCH X_{2} COOC X_{2} H X_{5}

, ethyl 3-oxobutanoate (ethyl acetoacetate).

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