Punjab Medical Punjab - MET Solved Paper-2004

  • question_answer
    \[{{C}_{6}}{{H}_{5}}N{{H}_{2}}\xrightarrow{NaN{{O}_{2}}HCl}X\xrightarrow{C{{u}_{2}}{{(CN)}_{2}}}\]\[Y\xrightarrow{{{H}_{2}}O/{{H}^{+}}}Z\]is identified as:

    A) \[{{C}_{6}}{{H}_{5}}-NH-C{{H}_{3}}\]

    B) \[{{C}_{6}}{{H}_{5}}-COOH\]

    C) \[{{C}_{6}}{{H}_{5}}-C{{H}_{2}}-N{{H}_{2}}\]

    D) \[{{C}_{6}}{{H}_{5}}-C{{H}_{2}}-COOH\]

    Correct Answer: B

    Solution :

    \[{{C}_{6}}{{H}_{5}}N{{H}_{2}}\xrightarrow{NaN{{O}_{2}}/HCl}{{C}_{6}}{{H}_{5}}{{N}_{2}}Cl\]\[\xrightarrow{C{{u}_{2}}{{(CN)}_{2}}}\underset{(Y)}{\mathop{{{C}_{6}}{{H}_{5}}CN}}\,\xrightarrow{{{H}_{2}}O/{{H}^{+}}}\] \[\underset{benzoic\,\,acid\,\,(Z)}{\mathop{{{C}_{6}}{{H}_{5}}-COOH}}\,\] Thus, product \[Z\] is identified as\[{{C}_{6}}{{H}_{5}}-COOH.\]


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