Manipal Engineering Manipal Engineering Solved Paper-2013

  • question_answer
    Which\[A\]gives red colour in the reaction                 \[A\xrightarrow[(ii)\,\,NaOH]{(i)\,\,HN{{O}_{2}}}red\,\,colour\]

    A) \[C{{H}_{3}}C{{H}_{2}}N{{O}_{2}}\]

    B)   \[{{(C{{H}_{3}})}_{2}}-CHN{{O}_{2}}\]

    C)   \[{{(C{{H}_{3}})}_{3}}CN{{O}_{2}}\] 

    D)  

    Correct Answer: A

    Solution :

    \[C{{H}_{3}}C{{H}_{2}}N{{O}_{2}}\xrightarrow{HN{{O}_{2}}}\,C{{H}_{3}}\underset{\begin{smallmatrix}   \\  blue\,\,(nutrioc\,acid) \end{smallmatrix}}{\mathop{\underset{\begin{smallmatrix}  || \\  \,\,\,\,\,\,\,\,\,\,N-OH \end{smallmatrix}}{\mathop{N}}\,{{O}_{2}}}}\,\]                                 \[\xrightarrow{NaOH}\,C{{H}_{3}}-\underset{\begin{smallmatrix}  || \\  NONa  \\  red \end{smallmatrix}}{\mathop{C}}\,-N{{O}_{2}}\] (b) \[C{{H}_{3}}CH\,N{{O}_{2}}\,\xrightarrow{HN{{O}_{2}}}\,\underset{\begin{smallmatrix}   \\  preudonitrol\,\,(blue) \end{smallmatrix}}{\mathop{C{{H}_{3}}-\underset{\begin{smallmatrix}  | \\  N=O \end{smallmatrix}}{\overset{\begin{smallmatrix}  C{{H}_{3}} \\  | \end{smallmatrix}}{\mathop{C}}}\,-N{{O}_{2}}}}\,\] \[\xrightarrow{NaOH}\,\] No reaction blue (c)\[{{(C{{H}_{3}})}_{3}}CN{{O}_{2}}\xrightarrow{HN{{O}_{2}}}\]No reaction


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