Manipal Medical Manipal Medical Solved Paper-2007

  • question_answer
    In Williamsons synthesis, .ethoxyethane is prepared by

    A)  passing ethanol over heated alumina

    B)  heating sodium ethoxide with ethyl bromide      

    C)  treating ethyl alcohol with excess of\[{{H}_{2}}S{{O}_{4}}\]at 430-440 K

    D)  heating ethanol with dry\[A{{g}_{2}}O\]

    Correct Answer: B

    Solution :

     \[\underset{Sodium\text{ }ethoxide}{\mathop{C{{H}_{3}}C{{H}_{2}}ONa}}\,+\underset{\begin{smallmatrix}  Bromo \\  ethane \end{smallmatrix}}{\mathop{{{C}_{2}}{{H}_{5}}Br}}\,\xrightarrow[synthesis]{Williamsons}\] \[\underset{Ethoxyethane}{\mathop{C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}C{{H}_{3}}}}\,+NaBr\]


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