Resonance Structures

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4 Terms

1
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What is a resonance structure?

The delocalization of pi electrons spreading out e- density over multiple atoms in a molecule.

2
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What is the true structure of a molecule?

True structure is an average (resonance hybrid) of all possible contributing structures.

3
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Why only pi bonds are involved in resonance and not sigma bonds?

They are e- in p-orbitals. —> more loosely held —> can delocalize across adjacent p-orbitals

4
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Three common qualities in a resonance? (3 bullet points)

  • lone e- pairs

  • a vacant orbital

  • radical (single unpaired e-)