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why co+ has bond order of 3.5?

saurav joshi , 12 Years ago
Grade 12th Pass
anser 1 Answers
ruchi yadav

Last Activity: 11 Years ago

The BO in CO+ is 3.5 because the order of the orbitals is not the same as it would be for a homonuclear diatomic molecule such as O2where both atoms are the same. In the case of CO, the 2s atomic orbital on Oxygen is much lower in energy than the 2s atomic orbital in carbon. The discrepancy in energies allows the 2p-pi and 2p-sigma molecular orbitals to sink lower than the 2s-sigma* orbital in the MO diagram. For this case the calculations would be:

For CO:

2s-sigma22p-pix22p-piy22p-sigmaz22s-sigma*2

BO = (8-2)/2 = 3

For CO+:

2s-sigma22p-pix22p-piy22p-sigmaz22s-sigma*1

BO = (8-1)/2 = 3.5



Thank You
Ruchi
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