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Q: If a compound has a strong and weak minus I group, will the stronger group always have a δ- charge?

Bongo ManIn a compound like acrolein (prop-2-enal or $\ce{CH2=CH-CHO}$, will the oxygen in the $\ce{-CHO}$ group always have a $\delta$- charge? Acrolein does have three resonance structures as shown below, in which on one of them, oxygen has a $\delta$+ charge. How stable is the third resonating struc...

 

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