The Lewis structure with a double bond is a simple model, but molecular orbital theory tells us that oxygen has two unpaired electrons in its π* orbitals. That’s why it’s paramagnetic.
This is like when a customer insists a blouse should be simple, but the fabric itself demands a more complex cut to lie properly.
My tuition sir made us learn the MO diagram by heart, saying the Lewis structure is just the first fitting, not the final truth.
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