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JCECE Medical JCECE Medical Solved Paper-2002

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

    A)  Hydrogenation

    B)  lodoform 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. \[\underset{2\,\text{butanol}}{\mathop{C{{H}_{3}}-C{{H}_{2}}-\overset{OH}{\mathop{\overset{|}{\mathop{C}}\,}}\,H-C{{H}_{3}}}}\,\] \[C{{H}_{3}}-\underset{1-\text{propanaol}}{\mathop{C{{H}_{2}}-\underset{H}{\overset{H}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,-OH}}\,\]
    Test 2-butanol 1-propanol
    [a] lodoform test Yellow ppt. No change
    [b] Lucas test Turbidity 5-10 min No change
    [c] Oxidation test Ketone formed Aldehyde formed
    [a] Product of hydrogenation do not show any change in appearance. So it cant be used to distinguish 2-butanol and l-propanol.


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