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

  • question_answer The order of basic strength among the following amines in benzene solution is  [AIIMS 1991; RPMT 2002]

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

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

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

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

    Correct Answer: B

    Solution :

                    \[\underset{{{K}_{b}}=}{\mathop{{}}}\,\underset{5.4\times {{10}^{-4}}}{\mathop{{{(C{{H}_{3}})}_{2}}NH}}\,>\underset{4.5\times {{10}^{-4}}}{\mathop{C{{H}_{3}}N{{H}_{2}}}}\,>\underset{0.6\times {{10}^{-4}}}{\mathop{{{(C{{H}_{3}})}_{3}}N}}\,\]

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