Which amongst the following is incorrect statement?

1. A. C2 molecule has four electrons in its two degenerate molecular orbitals
2. B. H2+ ion has one electron
3. C. O2+ ion is diamagnetic
4. D. The bond orders of O2+ , O2 , O2 - and O2 2- are 2.5, 2, 1.5 and 1, respectively

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