According to $MOT$,which of the following is correct?

  • A
    $LUMO$ level for $C_2$ molecule is $\sigma_{2p_x}$ orbital
  • B
    In $C_2$ molecule,both bonds are $\pi$ bonds
  • C
    In $C_2^{2-}$ ion,there is one $\sigma$ and two $\pi$ bonds
  • D
    All above are correct

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