J & K CET Medical J & K - CET Medical Solved Paper-2011

  • question_answer
    Which of the esters shown, after reduction with\[LiAl{{H}_{4}}\]and aqueous workup, will yield two molecules of only a single alcohol?

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

    B)  \[C{{H}_{3}}C{{H}_{2}}COOC{{H}_{2}}C{{H}_{3}}\]

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

    D)  \[C{{H}_{3}}COOC{{H}_{3}}\]

    Correct Answer: C

    Solution :

                    \[RCOOR+4H\xrightarrow[{}]{LiAl{{H}_{4}}}RC{{H}_{2}}OH+ROH\] \[{{C}_{6}}{{H}_{5}}COO{{C}_{6}}{{H}_{5}}+4H\xrightarrow{LiAl{{H}_{4}}}{{C}_{6}}{{H}_{5}}C{{H}_{2}}OH\]                                                                 \[+{{C}_{6}}{{H}_{5}}OH\] \[C{{H}_{3}}C{{H}_{2}}COOC{{H}_{2}}C{{H}_{3}}+4H\xrightarrow[{}]{LiAl{{H}_{4}}}\]                 \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}OH+C{{H}_{3}}C{{H}_{2}}OH\] \[{{C}_{6}}{{H}_{5}}COOC{{H}_{2}}{{C}_{6}}{{H}_{5}}+4H\xrightarrow[{}]{LiAl{{H}_{4}}}{{C}_{6}}{{H}_{5}}C{{H}_{2}}OH\]                                                        \[+{{C}_{6}}{{H}_{5}}C{{H}_{2}}OH\] \[C{{H}_{3}}COOC{{H}_{3}}+4H\xrightarrow{LiAl{{H}_{4}}}C{{H}_{3}}C{{H}_{2}}OH\]                                                           \[+C{{H}_{3}}OH\]


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