Applications of resonance in chemistry?

[hivesaeed4]

While reading organic chemistry, the textbook said that resonance is something which is found everywhere in chemistry. It applies everywhere in chemistry and so on. However so far the only application I've found of resonance is that the more resonance structures a certain molecule has, the more stable it is.

Can anybody give me any other applications of resonance in chemistry?

 

[DrDu]

The transition state in a chemical reaction, e.g. an SN2 substitution, can be described as a resonance of structures where the either the nucleophilic or nucleofugic group is bound to the central carbon atom.
See, e.g.,
http://books.google.de/books?hl=de&...jr47wo#v=onepage&q=shaik valence bond&f=false