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Which amongst the following is incorrect statement
A
$O_2^+$ ion is diamagnetic.
B
The bond orders of $O_2^+$, $O_2$, $O_2^-$ and $O_2^{2-}$ are 2.5, 2, 1.5 and 1, respectively
C
$C_2$ molecule has four electrons in its two degenerate $\pi$ molecular orbitals.
D
$H_2^+$ ion has one electron.
