NEET Chemistry NEET PYQ-Coordination Chemistry

  • question_answer
    Crystal field stabilization energy for high spin d4 octahedral complex is         [AIPMT (S) 2010]

    A) \[-1.8{{\Delta }_{o}}\]

    B) \[-1.6{{\Delta }_{o}}+P\]

    C) \[-1.2{{\Delta }_{o}}\]

    D) \[-0.6{{\Delta }_{o}}\]

    Correct Answer: D

    Solution :

    [d] Key Idea In case of high spin complex, \[{{\Delta }_{o}}\] is small. Thus, the energy required to pair up the fourth electron with the electrons of lower energy d-orbitals would be higher than that required to place the electrons in the higher d-orbital. Thus, pairing does not occur.
    For high spin d4 octahedral complex,
    \[\therefore \]Crystal field stabilization energy
                \[=(-3\times 0.4+1\times 0.6){{\Delta }_{o}}\]
                \[=(-1.2+0.6)\,{{\Delta }_{o}}\]
                \[=-0.6\,{{\Delta }_{o}}\]


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