JEE Main & Advanced Chemistry Carboxylic Acids Question Bank Properties of Carboxylic Acids and Their Derivatives

  • question_answer
    On prolonged heating of ammonium cyanate or urea, we get     [DPMT 1982; CPMT 1979; MP PMT 1996]

    A)                 \[{{N}_{2}}\]     

    B)                 \[C{{O}_{2}}\]

    C)                 Biurette              

    D)                 Ammonium carbonate

    Correct Answer: C

    Solution :

               \[\underset{\text{Ammonium cyanate}}{\mathop{N{{H}_{4}}CNO}}\,\xrightarrow{\Delta }\,\,\,\underset{\text{Urea}}{\mathop{N{{H}_{2}}-CO-N{{H}_{2}}}}\,\]            \[\underset{{}}{\mathop{N{{H}_{2}}-CO-N{{H}_{2}}}}\,+\underset{\text{Urea}}{\mathop{H-NH-CO-N{{H}_{2}}}}\,\underset{-N{{H}_{3}}}{\mathop{\xrightarrow{\Delta }}}\,\]                                 \[\underset{\text{Biuret}}{\mathop{N{{H}_{2}}-CO-NH-CO-N{{H}_{2}}}}\,\]


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