JCECE Engineering JCECE Engineering Solved Paper-2005

  • question_answer
    Conversion of benzaldehyde to 3-phenyl-prop-2-en-1-oic acid is:

    A)  Perkin condensation

    B)  Claisen condensation

    C)  Oxidative addition

    D)   Aldol condensation

    Correct Answer: A

    Solution :

    (i) Benzaldehyde does not undergo aldol condensation as it does not have \[d-\]hydrogen atom. (ii) Perkin condensation \[\underset{benzaldehyde}{\mathop{{{C}_{6}}{{H}_{5}}CHO}}\,+\underset{acetic\,\,anhydride}{\mathop{{{(C{{H}_{3}}CO)}_{2}}O}}\,\xrightarrow[-{{H}_{2}}O,\,\,\Delta ]{C{{H}_{3}}COONa}\] \[{{C}_{6}}{{H}_{5}}CH=CHCOOH+C{{H}_{3}}COOH\]      3-phenyl prop-2-en-loic acid


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