Question

What is the main element needed to consider a compound organic?

Answer 1

Carbon `C`

Explanation:

Life as we know it , is based on more or less complicated carbon-based molecules. we may say that (almost) all 'organic' compounds contain carbon.

On the other hand: not all carbon containing compounds are organic. An example is calcium carbonate `CaCO_3`, also known as calcite, marble o.a., that may have a non-organic origin.