A) Reformatsky reaction
B) Claisen condensation
C) Cannizaros reaction
D) Wittig reaction
Correct Answer: B
Solution :
Claisen condensation involves self condensation of two molecules of ester containing a-hydrogen in the presence of a strong base such as sodium ethoxide to form \[\beta -\]keto ester. \[C{{H}_{3}}-\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{C}}\,----C{{H}_{2}}-\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{C}}\,-O{{C}_{2}}{{H}_{5}}\]\[\xrightarrow[-{{C}_{2}}{{H}_{5}}OH]{{{C}_{2}}{{H}_{5}}ONa}\underset{\begin{smallmatrix} ethyl\text{ }acetoaceiate \\ (\beta -ketoester) \end{smallmatrix}}{\mathop{C{{H}_{3}}-\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{C}}\,-\,-\,\,\,\,\,\,C{{H}_{2}}-\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{C}}\,-O{{C}_{2}}{{H}_{5}}}}\,\]
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