Question

Why is the chemistry of `CO_2`, and `CO` not included in organic chemistry?

Answer 1

Well, because by tradition they were not considered to fall under the purview of organic chemistry............

Explanation:

An organic compound is typically composed of `C,H,N, O` atoms, and a few other heteroatoms, and typically, in MOST circumstances we would see catenation, with a resulting `C-C` chain of varying length.

Organic chemistry is usually presumed to operate under reducing conditions, which is a good thing because under oxidizing conditions all carbon and nitrogen species would oxidize to `CO_2` and nitrogen oxides.

The distinction is thus more historical than actual.