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JEE Main & Advanced Sample Paper JEE Main Sample Paper-27

  • question_answer
    \[{{[Fe\,{{(en)}_{2}}{{({{H}_{2}}O)}_{2}}]}^{2+}}+en\to \]complex(X). The correct statement about the complex (X) is:      

    A)  it is a low spin complex.

    B)  it is diamagnetic.

    C)  it shows geometrical isomerism

    D)  (a) and (b) both.

    Correct Answer: D

    Solution :

    \[{{[Fe{{(en)}_{2}}{{({{H}_{2}}O)}_{2}}]}^{2+}}\,+en\to {{[Fe{{(en)}_{3}}]}^{2+}}+2{{H}_{2}}O\] Complex is \[{{[Fe{{(en)}_{3}}]}^{2+}},\,\,'en'\] is a strong field ligand and thus it is inner orbital complex \[({{d}^{2}}\,s{{p}^{3}})\] and diamagnetic. It is \[M{{(AA)}_{3}}\] type which has only one form.


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