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Problems and exercisesResonance Structures

Write the resonance structures that contribute to the resonance hybrid of the following species:

Species to write their resonance forms: acetate, nitromethane, formaldehyde, carbocations, carbanions, dienes and others

Which of the following species have delocalized electrons?

Molecules for which to decide whether resonance forms exist

Draw the resonance structures of the following species. Which form contributes most and which least to the resonance hybrid? In which cases do the resonance forms contribute equally?

Molecules and ions for which to write and assess resonance forms

Are the following pairs of structures resonance forms, different species or the same species?

Pairs of structures to decide whether they are resonance forms, different compounds or the same species

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