According to crystal field theory,for which of the following coordination entities is $\Delta_o$ maximum?

  • A
    $[CoCl(NH_3)_5]^{2+}$
  • B
    $[Co(NH_3)_6]^{3+}$
  • C
    $[Co(CN)_6]^{3-}$
  • D
    $[Co(NH_3)_5(H_2O)]^{3+}$

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