JIPMER Jipmer Medical Solved Paper-1999

  • question_answer
    The weakest base among the following is:

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

    B)         \[{{(C{{H}_{3}})}_{2}}NH\]         

    C)         \[{{(C{{H}_{3}})}_{3}}N\]            

    D)         \[{{C}_{6}}{{H}_{5}}N{{H}_{2}}\]

    Correct Answer: D

    Solution :

    The correct order of increasing basicity among amines is \[aryl\,\,1{}^\circ <1{}^\circ <3{}^\circ <2{}^\circ \] Hence, aniline \[({{C}_{6}}{{H}_{5}}N{{H}_{2}})\]base. As in it, resonance is possible, which decrease electron density on N-atom, hence, it does not loose its lone pair of electron easily.


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