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WB JEE Medical WB JEE Medical Solved Paper-2008

  • question_answer
    \[\text{RC}{{\text{H}}_{\text{2}}}\text{C}{{\text{H}}_{\text{2}}}\text{OH}\] can   be   converted   to \[\text{RC}{{\text{H}}_{\text{2}}}\text{C}{{\text{H}}_{\text{2}}}\text{COOH}\] by the following sequence of steps

    A)  \[PB{{r}_{3}},KCN,{{H}_{3}}{{O}^{+}}\]

    B)  \[PB{{r}_{3}},KCN,{{H}_{2}}/{{P}^{+}}\]

    C)  \[KCN,{{H}_{3}}{{O}^{+}}\]

    D)  \[HCN,PB{{r}_{3}},{{H}_{3}}{{O}^{+}}\]

    Correct Answer: A

    Solution :

                     \[RC{{H}_{2}}C{{H}_{2}}OH\xrightarrow{PB{{r}_{3}}}RC{{H}_{2}}C{{H}_{2}}Br\downarrow \]\[RC{{H}_{2}}C{{H}_{2}}COOH\xleftarrow{{{H}_{3}}{{O}^{+}}}RC{{H}_{2}}-C{{H}_{2}}-CN\]


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