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allylic vs. vinylic

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polly:
why is allylic more stable then vinylic?

Mitch:
Can you draw a resonance for the vinylic ion? Can you draw one for the allylic ion?

polly:
thanks- understood.  allylic is much more stable bc the radical carbon adopts an sp2 hybridization which puts the unpaired electron in a p orbital giving a symmetrical structure - having resonance forms.  

Mitch:
That was said very well. I don't think I could of said it better.

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