We must have to remember that organic and inorganic are two different classes of chemistry. When we talk about any salt like sodium chloride, barium sulphate these salts or compounds come under the category of inorganic species since they don’t contain an atom which is said to be organic.Complete answer:
We will look at an example of acids to define organic or inorganic acid. Acetic acid, Formic acid they come under the category of organic acid. Now the question comes why they are organic and not inorganic? So the answer to this problem is that both these acids contain carbon atoms which are considered to be organic.
This structure is for formic acid. You can see it has a carbon atom.
While inorganic acid is the one that does not contain carbon atoms. Like hydrochloric acid, Sulfuric acid these acids do not contain carbon atoms.
\[HCl\]: This is a molecular formula for hydrochloric acid that contains hydrogen atom and chlorine atom.
We can look at the organic molecules to know about the structure and see what atoms does it contains
When we look at the structure of tartaric acid, we can easily say that it is an organic acid since it contains carbon atoms.
So we can conclude that an organic molecule is the one that contains carbon atoms.Note:
We must have to remember that the organic molecule can be linear or cyclic. Examples for cyclic organic molecules can be benzene molecules whereas linear molecules can be acetic acid, formic acid which can also be known as aliphatic molecule while cyclic one can be termed as aromatic molecule.