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JEE Main & Advanced Chemistry Nitrogen Containing Compounds Question Bank Critical Thinking Nitrogen

  • question_answer
    Indicate which nitrogen compound amongst the following would undergo Hofmann's reaction (i.e. reaction with \[B{{r}_{2}}\] and strong KOH) to furnish the primary amine (\[R-N{{H}_{2}}\]) [CBSE PMT 1989]

    A)                 \[R-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-NH.C{{H}_{3}}\]         

    B)                 \[R-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-O.N{{H}_{4}}\]

    C)                 \[R-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-N{{H}_{2}}\]

    D)                 \[R-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-NHOH\]

    Correct Answer: C

    Solution :

               Hofmann degradation of amide                    \[R-CoN{{H}_{2}}+B{{r}_{2}}+4KOH\xrightarrow{{}}\]\[\underset{\text{primary amine}}{\mathop{R-N{{H}_{2}}}}\,+2KBr+{{K}_{2}}C{{O}_{3}}+2{{H}_{2}}O\]


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