CHM136H1 Lecture Notes - Lecture 5: Organic Chemistry, Electronegativity, Conjugate Acid

• School: UTSG
• Department: Chemistry
• Course: CHM136H1
• Professor: Clive Scott Browning, Kristine Quinlan

Document Summary

Resonance structures & acids & bases (lecture 5) Why do we use resonance structures there are molecules and ions that we can draw a single structure to represent so we draw multiple structures that together represents a single structure of the molecule. These molecules have partial pi bonds, lone pairs and/or charge cannot represent this with a single structure. Delocalization electrons spread over more of the structure (stabilizing effect) Curved arrow show the movement of a pair of electrons. Drawing resonance structures any three-atom grouping with p-orbitals on each atom has two possible resonance forms. ** resonance forms on the atom that is more electronegative (eg. structure that has negative charge on oxygen rather than carbon would contribute more to the overall resonance structure) ** ** must draw equivalent structures (even though they can be flipped) because they show the presence of delocalized electrons **