A) \[C{{H}_{3}}COO{{C}_{2}}{{H}_{5}}\]
B) \[C{{H}_{3}}CHO\]
C) \[{{C}_{6}}{{H}_{5}}Cl\]
D) \[HCHO\]
Correct Answer: A
Solution :
Key Idea: Esters having \[\alpha -H\]atoms undergo Claisen condensation. The esters having \[\alpha -H\]atoms in presence of strong base (eg, sodium ethoxide) undergo self condensation reaction to form \[\beta -\]keto ester. \[\underset{\,\,\,\,\,\,\,\,\,\,\text{ethyl}\,\text{acetate}}{\mathop{C{{H}_{3}}-\overset{O}{\mathop{\overset{|\,|}{\mathop{C}}\,}}\,}}\,--C{{H}_{2}}COO{{C}_{2}}{{H}_{5}}\] \[\xrightarrow{{{C}_{2}}{{H}_{5}}ONa}\underset{\text{ethyl}\,\text{acetoacetate}}{\mathop{C{{H}_{3}}-\overset{\text{O}}{\mathop{\overset{|\,\,|}{\mathop{C}}\,}}\,-}}\,C{{H}_{2}}COO{{C}_{2}}{{H}_{5}}\] \[+\,{{C}_{2}}{{H}_{5}}OH\]
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