Question

What are the major branches and sub branches of chemistry?

Answer 1

organic chemistry
inorganic chemistry

Answer 2

I'd say also include Analytical, Physical, and Biochemisty. If you're looking for a textbook-like answer, most textbooks nowadays say there are 5 branches.

Sub-branches is really subjective. Like thermochemisty could go under physical chemistry and photochemistry could go under biochemistry or even inorganic depending what reactions you're studying...