J & K CET Engineering J and K - CET Engineering Solved Paper-2012

  • question_answer
    A ketone gives a yellow ppt when treated with  \[{{\text{I}}_{\text{2}}}\] in an alkaline solution. Thus, the ketone is

    A)  a cyclic ketone

    B)  a methyl ketone 

    C)  an unsaturated ketone

    D)  None of the above

    Correct Answer: B

    Solution :

     The ketone is a methyl ketone because this test is known as iodoform test and is only shown  by  compounds  that  contain\[C{{H}_{3}}-\underset{O}{\mathop{\underset{||}{\mathop{C}}\,}}\,\]or \[C{{H}_{3}}-\underset{OH}{\mathop{\underset{\,|}{\mathop{C}}\,}}\,-\] groups and results in the  formation of yellow ppt of iodoform \[(CH{{I}_{3}}).\]


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