# Do all organic molecules contain carbon, hydrogen, and oxygen?

Nov 11, 2015

No, but they all contain carbon and hydrogen.

#### Explanation:

Almost all organic molecules contain carbon and hydrogen, and many contain other elements as well.

For example, ethane is ${\text{CH"_3"CH}}_{3}$. It contains only carbon and hydrogen.

Ethanol is $\text{CH"_3"CH"_2"OH}$. It contains oxygen as well.

Glycine is $\text{H"_2"NCH"_2"COOH}$. This one adds nitrogen.

There are many more examples, but all contain carbon and hydrogen.