The bond order of CO and O2 is
3 and 2
3 and 2.5
3 and 1.3
3 and 3.5
Bond order is the number of chemical bonds between a pair of atoms in a molecule.
The structure of CO and O2 is
Therefore bond order of CO is 3 and the bond order of O2 is 2.
Hence Option number (1) is correct.
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