Resonance Key

Resonance Worksheet Key
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Why aren't the structure pairs shown below resonance structures?
An H has moved from a C to an O. For two structures to be resonance forms,
the connection of atoms must be identical.
Draw at least two resonance structures for each structure shown below. Indicate which is most
stable or, especially, if any two structures are equally stable. You will have to fill in lone pairs or
formal charges if they are missing.