BCECE Medical BCECE Medical Solved Papers-2002

  • question_answer
    Benzaldehyde on treatment with ethanolic KCN produce :

    A)  \[{{C}_{6}}{{H}_{5}}COCO{{C}_{6}}{{H}_{5}}\]

    B)  \[{{C}_{6}}{{H}_{5}}CHOHCN\]

    C)  \[{{C}_{6}}{{H}_{5}}CHOHCOOH\]

    D)  \[{{C}_{6}}{{H}_{5}}CHOHCO{{C}_{6}}{{H}_{5}}\]

    Correct Answer: D

    Solution :

    Key Idea: When 2 molecules of aromatic aldehydes condense in presence of ale, KCN, it is called benzoin condensation \[\underset{benzaldehyde}{\mathop{2{{C}_{6}}{{H}_{5}}CHO}}\,\,\,\xrightarrow{KCN\text{ (}ale.\text{)}}\underset{benzoin}{\mathop{{{C}_{6}}{{H}_{5}}CHOH-CO-{{C}_{6}}{{H}_{5}}}}\,\]


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