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JCECE Engineering JCECE Engineering Solved Paper-2002

  • question_answer
    Which test is not ideal to distinguish 2-butanol and \[1-\]propanol?

    A)  Hydrogenation                

    B)  Iodoform test

    C)   Lucas test         

    D)   Oxidation test

    Correct Answer: A

    Solution :

    Key Idea: The test in which the substances which are to be distinguished give different coloured solution\[/ppt\] or smell are useful in distinguishing substances. \[\underset{\text{2butanol}}{\mathop{C{{H}_{3}}-C{{H}_{2}}-\overset{\begin{smallmatrix}  OH \\  | \end{smallmatrix}}{\mathop{C}}\,H-C{{H}_{3}}}}\,\] \[\underset{1-propanol}{\mathop{C{{H}_{3}}-C{{H}_{2}}-\underset{\begin{smallmatrix}  | \\  H \end{smallmatrix}}{\overset{\begin{smallmatrix}  H \\  | \end{smallmatrix}}{\mathop{C}}}\,-OH}}\,\]
    Test 2-butanol 1-propanol
    [a] Iodoform test Yellow\[ppt\] No change
    [b] Lucas test Turbidity\[5-10\min \] No change
    [c] Oxidation test Ketone Aldehyde formed
    [a] Product of hydrogenation do not show any change in appearance. So it can't be used to distinguish 2-butanol and 1-propanol.


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