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Now when I say 'unusual',
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that implies that you know what usual stability is.
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So compared to what is it unusual?
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And we'll address that question later on.
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So let me just give you finally an example of equilibrium versus resonance.
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So this, as you'll learn when you learn functional groups,
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is a carboxylic acid, and you could have the hydrogen attached
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to this oxygen or it could be attached to the other oxygen.
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So these are not just the same thing upside down.
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It's the hydrogen being attached to one
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or being attached to the other of the two oxygens.
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And, in fact, it is that way.