RAJASTHAN ­ PET Rajasthan PET Solved Paper-2004

  • question_answer
    Which forms on the reaction of propyne with dil.\[{{H}_{2}}S{{O}_{4}}\] in the presence of mercuric ion?

    A)  2-propanol       

    B)  Propanone

    C)  Propanal    

    D)  1, 2-propane diol

    Correct Answer: B

    Solution :

     \[\underset{propyne}{\mathop{C{{H}_{3}}-C\equiv CH}}\,+H-OH\xrightarrow[{}]{Dil.{{H}_{2}}S{{O}_{4}}}\] \[\underset{enolic\text{ }form}{\mathop{C{{H}_{3}}-\underset{\begin{smallmatrix}  | \\  OH \end{smallmatrix}}{\mathop{C}}\,=C{{H}_{2}}}}\,\underset{\begin{smallmatrix}  keto\text{ }form \\  propanone \end{smallmatrix}}{\mathop{C{{H}_{3}}-\underset{\begin{smallmatrix}  || \\  O \end{smallmatrix}}{\mathop{C}}\,=C{{H}_{3}}}}\,\]


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