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MGIMS WARDHA MGIMS WARDHA Solved Paper-2003

  • question_answer
    The reaction,\[2C{{H}_{3}}-\underset{\begin{smallmatrix}  |\,| \\  O \end{smallmatrix}}{\mathop{C}}\,-O{{C}_{2}}{{H}_{5}}\xrightarrow[{}]{{{C}_{2}}{{H}_{5}}ONa}\]\[C{{H}_{3}}-\underset{\begin{smallmatrix}  |\,| \\  O \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{2}}-\underset{\begin{smallmatrix}  |\,| \\  O \end{smallmatrix}}{\mathop{C}}\,-O{{C}_{2}}{{H}_{5}}+{{C}_{2}}{{H}_{5}}OH\]is called:

    A)  Etard reaction

    B)  Perkin's reaction

    C)   Claisen condensation

    D)  Claisen Schmidt reaction

    Correct Answer: C

    Solution :

                     2 molecules of ester condense to give\[\beta -\]keto ester, in presence of alkali. This reaction is called Claisen condensation\[2C{{H}_{3}}-\overset{\begin{smallmatrix}  O \\  || \end{smallmatrix}}{\mathop{C}}\,-O{{C}_{2}}{{H}_{5}}\xrightarrow{{{C}_{2}}{{H}_{5}}ONa}\]\[\underset{ethyl\text{ }aceto\text{ }acetate}{\mathop{C{{H}_{3}}\overset{\begin{smallmatrix}  O \\  || \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{2}}\overset{\begin{smallmatrix}  O \\  || \end{smallmatrix}}{\mathop{C}}\,-O{{C}_{2}}{{H}_{5}}}}\,+{{C}_{2}}{{H}_{5}}OH\]


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