Which of the following orders is not correct?

  • A
    $[Co(H_2O)_6]^{+2} < [Fe(H_2O)_6]^{+3} < [Fe(CN)_6]^{-3}$ ($\Delta_0$ order)
  • B
    $[Fe(CN)_6]^{-4} > [Fe(CN)_6]^{-3}$ ($Fe-C$ bond length)
  • C
    $CN^- < CO$ ($\pi$-accepting tendency)
  • D
    $C_2H_4 > K[PtCl_3(C_2H_4)]$ ($C-C$ bond length)

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