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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.
Some molecules have two or more chemically equivalent Lewis electron structures, called resonance structures. Resonance is a mental exercise and method within the Valence Bond Theory of bonding that describes the delocalization of electrons within molecules.
There are two major resonance possible. The two structure differ in the lcoation of the double bond. The anion, cation, or radical is stabilized by declocaliztion.
Resonance structures are two examples of a molecule in which the chemical interaction is the same, but the electrons are distributed around the structure differently. When electrons may pass through opposing pi structures, resonance occurs.
The discussion of the 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.
Introduction to resonance structures, when they are used, and how they are drawn.
In this tutorial on resonance structures, you will learn what resonance structures are and how to find all of the possible resonance structures a molecule has. You will also learn how to identify and compare the stability among these structures.
