2.4 Resonance | Organic Chemistry

Chad gives a comprehensive lesson on Resonance, showing organic chemistry students exactly how to draw resonance structures easily. He starts by reviewing what students would have learned in General Chemistry including the idea that resonance implies delocalized electrons which typically results in greater stability. He then covers numerous resonance structure examples relevant to organic chemistry including resonance with carbocations, resonance with lone pairs of electrons, resonance with radicals, and how to draw resonance structures with arrows. He also shows how to predict what the structure of the resonance hybrid should look like and how to determine which resonance structures are major or minor contributors. Finally, Chad shows the relationship between resonance and hybridization, and how to properly determine the hybridization of an atom when resonance is a factor.

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00:00 Lesson Introduction
00:23 Introduction to Resonance
05:02 Drawing Resonance Structures (Arrow-Pushing)
11:29 Drawing Resonance Structures for Stabilizing Carbocations
16:22 Drawing Resonance Structures for Stabilizing Lone Pairs
20:30 Drawing Resonance Structures for Stabilizing Radicals
22:19 Determining Major and Minor Resonance Contributors
27:08 Additional Examples with Drawing Resonance Structures
36:18 Resonance and Hybridization

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