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CMC Medical CMC-Medical VELLORE Solved Paper-2014

  • question_answer
    The final product of the following sequence of reaction is\[\underset{C{{H}_{2}}}{\overset{C{{H}_{2}}}{\mathop{||}}}\,\xrightarrow[CC{{l}_{4}}]{B{{r}_{2}}}A\xrightarrow[{}]{KCN}B\xrightarrow[{}]{{{H}^{+}}/{{H}_{2}}O}C\]

    A)  \[\underset{C{{H}_{2}}-COOH}{\overset{C{{H}_{2}}-COOH}{\mathop{|}}}\,\]   

    B)  \[\underset{C{{H}_{2}}-Br}{\overset{C{{H}_{2}}-Br}{\mathop{|}}}\,\]

    C)  \[\underset{C{{H}_{2}}-CN}{\overset{C{{H}_{2}}-COOH}{\mathop{|}}}\,\]         

    D)  \[\underset{C{{H}_{2}}-CN}{\overset{C{{H}_{2}}-CN}{\mathop{|}}}\,\]

    Correct Answer: A

    Solution :

    \[\underset{(A)}{\mathop{\underset{C{{H}_{2}}}{\overset{C{{H}_{2}}}{\mathop{||}}}\,\xrightarrow[CC{{l}_{4}}]{B{{r}_{2}}}\underset{C{{H}_{2}}Br}{\overset{C{{H}_{2}}Br}{\mathop{|}}}\,\xrightarrow[-2KBr]{KCN}\underset{C{{H}_{2}}CN}{\overset{C{{H}_{2}}CN}{\mathop{|}}}\,}}\,\]\[\xrightarrow[{{H}_{2}}O]{{{H}^{+}}}\underset{Succinic\,\,acid}{\mathop{\underset{C{{H}_{2}}COOH}{\overset{C{{H}_{2}}COOH}{\mathop{|}}}\,}}\,\]


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