How to draw resonance contributors and resonance hybrid?

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redfox
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How to draw resonance contributors and resonance hybrid?

Post by redfox »

I know how to draw some of these, I think, but not very well.
If I have, say buta-1,3-diene the first double bond should always be between C1 and C2 and the second between C3 and C4, right? So how would contributors be drawn for these and what would the hybrid be? I thought maybe the dashed pi bond between all of them tho I'm not convinced by that.
Please explain any answers and a drawing (if possible) would really help! Ta:)
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