JEE Main & Advanced Chemistry Alcohols, Phenols and Ethers / एल्कोहॉल, फीनॉल तथा ईथर Question Bank Properties of alcohol Phenol and Ethers

  • question_answer
    Which of the following vapours passed over heated copper to form acetone      [BIT 1992]

    A)                 \[{{H}_{3}}C-C{{H}_{2}}-C{{H}_{2}}OH\]

    B)                 \[\underset{\underset{OH}{\mathop{|}}\,}{\mathop{C{{H}_{3}}-CH-C{{H}_{3}}}}\,\]

    C)                 \[\begin{matrix}    C{{H}_{3}} & - & {} & {} & {}  \\    C{{H}_{3}} & > & C & - & OH  \\    C{{H}_{3}} & {} & {} & {} & {}  \\ \end{matrix}\]

    D)                 \[C{{H}_{2}}=CH-C{{H}_{2}}OH\]

    Correct Answer: B

    Solution :

               Secondary alcohol on dehydrogenation gives acetone                                 \[C{{H}_{3}}-\underset{\underset{OH}{\mathop{|\,\,\,\,}}\,}{\mathop{CH}}\,-C{{H}_{3}}\underset{{{300}^{0}}C}{\mathop{\xrightarrow{Cu}}}\,\,C{{H}_{3}}-\underset{\underset{O}{\mathop{||}}\,}{\mathop{C}}\,-C{{H}_{3}}+{{H}_{2}}\]


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