Is everything in organic chemistry arbitrary? [closed]








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I am a student who is trying to study organic chemistry. I'm using McMurry's book for it. As a beginner in chemistry, I have a fundamental question about chemistry itself. Are most of the chemistry's reaction rules, proved in a way of experiment and probability? Especially for organic chemistry. I really can't get why the reactions occur and there seem to be too many exceptions. When I ask teachers, they say it is because they just found them by experiment. But it seems to be too much for to just say that all the knowledge is just from experiences. There must be some fundamental rules. 


So my question is 


* How do we find organic chemistry reactions?
* Where do we use the reactions that we find in books?
* Are there other important rules in a molecule or the electrons that are in the molecule besides the induction and resonance effect?
* Can't organic chemistry be more rigid (I can't find a good word for this)? Studying McMurry's book, the products of the reactions seems to be determined arbitrarily.


