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Resonance structures are used when one Lewis structure for a single molecule cannot fully describe the bonding that takes place between neighboring atoms relative to the empirical data for the actual bond lengths between those atoms.
Resonance plays an important part in a molecule’s reactivity and stability. It is important to understand how electrons move around within a molecule because as you start to get introduced to reactions and reaction mechanisms, the order in which the electrons move becomes critical.
16 gru 2021 · The discussion of resonance effect heavily relies on the understanding of resonance structures. Here we will focus on how to draw resonance structures (or resonance contributors) for organic chemistry species, and how to compare the relative stabilities between the structures.
Resonance is a technique of describing the delocalized electrons in a molecule or ion that a single Lewis structure cannot describe. It is a phenomenon that explains the shifting of non-bonding electrons and pi bonds within the molecule.
Resonance theory is a simplified alternative to rigorous mathematical descriptions of molecular structure and when used in qualitatively is a convenient method for depicting electron delocalization in molecules. It is among the most useful concepts for the introductory organic chemistry student.
I. RESONANCE STRUCTURES. Lewis formulas are misleading in the sense that atoms and electrons are shown as being static. But we know that a given compound can have several valid Lewis formulas. For example CH3CNO can be represented by at least three different Lewis structures called resonance forms, or resonance structures:
Definition. Resonance structures are the multiple Lewis structures of similar energy, the position of nuclei, bonding and the non-bonding pair of electrons that can accurately describe a molecule. They are taken as canonical structures of the hybrid molecules formed by the superimposition of multiple Lewis structures.
