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J & K CET Medical J & K - CET Medical Solved Paper-2003

  • question_answer
    Nitrosoamines\[({{R}_{2}}N-N=O)\]are soluble in water. On heating them with cone.\[{{H}_{2}}S{{O}_{4}},\]they give secondary amines. The reaction is called:

    A)  Perkins reaction

    B)  Fries reaction

    C)  Libermann nitroso reaction

    D)  Etard reaction

    Correct Answer: C

    Solution :

                    Nitrosoamine on heating with cone.\[{{H}_{2}}S{{O}_{4}}\]gives secondary amine. This reaction is called Libermann nitroso reaction. \[\underset{nitrosoamine}{\mathop{{{R}_{2}}N-N=O}}\,+{{H}_{2}}O\xrightarrow[{}]{conc.\,{{H}_{2}}S{{O}_{4}}}\underset{\begin{smallmatrix}  secondary \\  amine \end{smallmatrix}}{\mathop{{{R}_{2}}NH}}\,\] \[+HN{{O}_{2}}\]


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