JEE Main & Advanced JEE Main Paper (Held On 22 April 2013)

  • question_answer For which of the following compounds Kjeldahl method can be used to determine the percentage of Nitrogen?     JEE Main  Online Paper (Held On 22 April 2013)

    A)  Nitrobenzene                     

    B)  Pyridine

    C)  Alanine                                

    D)  Diazomethane

    Correct Answer: C

    Solution :

     Kjeldahl?s method is not applicable for compounds in which nitrogen is directly   linked to oxygen e.g. nitro, pyridine, nitroso andazo. Hence only Alanine can be used to determine percentage of nitrogen. \[{{H}_{2}}N\_\_\_\underset{\begin{smallmatrix}  \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,CH{{(C{{H}_{3}})}_{2}} \\  \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\text{Alanine} \end{smallmatrix}}{\mathop{\underset{|}{\mathop{C}}\,}}\,H\,\,\,\_\_\_COOH\]


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