Punjab Medical Punjab - MET Solved Paper-2007

  • question_answer
    \[n-\]propyl alcohol and isopropyl alcohol can be chemically distinguished by which reagent

    A)  PCIs

    B)  reduction

    C)  oxidation with potassium dichromate

    D)  ozonolysis

    Correct Answer: C

    Solution :

    \[n-\]propyl alcohol and isopropyl alcohol gives different product on oxidation with\[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]. \[C{{H}_{3}}\underset{\begin{smallmatrix}  n-propyl \\  alcohol \end{smallmatrix}}{\mathop{-C{{H}_{2}}}}\,-C{{H}_{2}}OH\xrightarrow[{{K}_{2}}C{{r}_{2}}{{O}_{7}}/{{H}_{2}}S{{O}_{4}}]{[O]}\] \[\underset{propionaldehyde}{\mathop{C{{H}_{3}}-C{{H}_{2}}-CHO}}\,\] \[C{{H}_{3}}-\underset{\begin{smallmatrix}  | \\  OH  \\  isopropyl\,\,alcohol \end{smallmatrix}}{\mathop{C}}\,H-C{{H}_{3}}\xrightarrow[{{K}_{2}}C{{r}_{2}}{{O}_{7}}/{{H}_{2}}S{{O}_{4}}]{[O]}\] \[C{{H}_{3}}-\underset{\begin{smallmatrix}  \,|\,\,| \\  O  \\  acetone \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{3}}\]


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