Not sure how to ask this question, I hope I can get a great, and edifying answer. I've been studying monomers and polymers recently, reading about the different methods used for synthesizing plastics. How high temperatures and catalysts are used to bind monomers to make carbon chains. Something still confused me though.
I saw a police story about a cop that used Ketamine on a suspect so I looked up the molecule and saw several similar molecules (methoxetamine, phencyclidine, tenocyclidine, tiletamine, eticyclidine, rolicyclidine, etc).
So when it comes to organic chemistry, what are the consistent methods for how they form these chemical structures almost like legos? I know they don't have atomic sized robot hands connecting them into certain shapes. How can they dictate the shape of the organic molecules using the same elements? What process determines the shape of an organic molecule?