RAJASTHAN PMT Rajasthan - PMT Solved Paper-2008

  • question_answer
    The correct order of increasing basic nature for the bases\[N{{H}_{3}},\,\,C{{H}_{3}}N{{H}_{2}}\]and\[{{(C{{H}_{3}})}_{2}}NH\]is

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

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

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

    D)        \[C{{H}_{3}}N{{H}_{2}}<{{(C{{H}_{3}})}_{2}}NH<N{{H}_{3}}\]

    Correct Answer: C

    Solution :

    \[N{{H}_{3}},\,\,C{{H}_{3}}N{{H}_{2}},\,\,{{(C{{H}_{3}})}_{2}}NH\] \[{{(C{{H}_{3}})}_{2}}NH+{{H}_{2}}O{{(C{{H}_{3}})}_{2}}N{{H}_{2}}+O{{H}^{-}}\] \[{{I}^{+}}\] effect maximum stabilization more \[H-\]bond stability high, hence most basic \[C{{H}_{3}}N{{H}_{2}}+{{H}_{2}}OC{{H}_{3}}\overset{+}{\mathop{N}}\,{{H}_{3}}+O{{H}^{-}}\] \[N{{H}_{3}}+{{H}_{2}}ONH_{4}^{+}+O{{H}^{-}}\]                                 \[{{K}_{1}}>{{K}_{2}}>{{K}_{3}}\] Hence, basicity order is                 \[{{(C{{H}_{3}})}_{2}}NH>C{{H}_{3}}N{{H}_{2}}>N{{H}_{3}}\]


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