J & K CET Engineering J and K - CET Engineering Solved Paper-2011

  • question_answer
    Which of the esters shown, after reduction with \[\text{LiAl}{{\text{H}}_{\text{4}}}\]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 :

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


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