Resonance Flashcards
Understanding Electron Delocalization and Resonance
Recall Lewis Structure
What are the criterias for satisfying correct Lewis Structure?
Atoms, Octet, ve-, Formal Charge
What is the possible amount of Lewis Structure an organic molecule can have?
2 or more
What is the principle behind the term ‘Resonance’?
Pi electrons are moving causing delocalization
What is the implication of polar molecule to pi bond?
The pi cloud become distorted which results to a higher density to the more electronegative atom.
Atoms will still share eclectrons because of the covalent bond
Dynamic nature of pi electrons
Why Resonance exists?
Because of the delocalization or mobility of pi electrons
What is the Resonance symbol?
Double headed arrow
Why does formal charge change?
Movement of electron
Should Carbon (C) adapt Octet Rule?
No
It is a Carbocation specie
Way of describing delocalized ve- with certain molecules where bonding cannot be expressed by one Lewis structure
Resonance
Which ones are able to participate in Resonance?
Pi electrons and lone pairs adjacent to pi bonds
Can we shift/delocalize electrons in sigma bonds?
No
What does breaking sigma bonds represent?
Chemical Reaction
Is Resonance a chemical reaction?
No
No changes in atomic structure or composition
True or False?
Resonance forms differ only in the placement of electrons.
True
If the placement/connectivity of atoms differs from its initial structure, is it still a Resonance?
No
It can be rather an Isomer
