Distinguish between organic and inorganic molecules?

Organic molecules are molecules that contain carbon-hydrogen bonds. Almost all organic molecules are hydrocarbons. They are called organic because they are essential for life to exist.

Some examples of organic molecules include:

Methane `(CH_4)`

Glucose `(C_6H_12O_6)`

Ethanol `(C_2H_5OH)` or `(C_2H_6O)`

Here is a picture of some more:

![http://www.compoundchem.com/2014/09/01/benzene-derivatives-in-organic-chemistry/]()

As you can see here, all of them contain carbon and hydrogen in their chemical structure.

I think you can guess then what are inorganic molecules. Well, they are molecules without carbon-hydrogen bonds. While they still can contain carbon compounds, such as `(CO_2)`, or hydrogen compounds, such as `(H_2O)`, they are not allowed to have carbon-hydrogen bonds, so molecules like `(C_2H_6)` are not considered inorganic.

However, some are still essential for life, such as

Water `(H_2O)`

Oxygen gas `(O_2)`

But mainly, some can be quite common compounds, with examples like

Rust `(Fe_2O_3*nH_2O)`

Table salt `(NaCl)`

Hydrochloric acid `(HCl)`

Here are pictures of the compounds I've mentioned above:

![http://www.fieldstation.net/tag/rust/]() Rust

![https://www.flickr.com/photos/11939863@N08/3793288383/in/photostream/]() Salt

![https://www.amazon.com/Hydrochloric-Reagent-Grade-Purity-Regia/dp/B00HWFHMP2]() Hydrochloric acid

I hope my explanation was clear!