organic chemistry..
A chemist
A Botanist is someone who studies plants.
The word organic originates from the notion in 19th century that "only" living creatures can produce carbon-containing molecules. Today, we know that this is not true... But, we still use the word "organic" to describe carbon compounds. It is more appropriate to call organic compounds or organic chemistry as carbon compounds and carbon chemistry.
A zoologist, zoology is the study of animals.
Someone who studies microscopic organisms such as bacteria, algae, etc. is called a microbiologist. A person who exclusively studies viruses, is referred to as a virologist.
I don't know what you call them, but they are studying organic chemistry.
A chemist
The variations of bonding with carbon. The word organic in organic chemistry pretty much mean carbon so you could call it carbon chemistry. Carbon has its own field because it can create insanely many compounds.
You call someone that studies metal a metallurgist.
A physicist.
a person who studies planets is a planetologist.
There is no special name for someone who studies Hebrew.
An Anthropologist.
malacologist
euclidist
Gemologists
psychologist