Rubber is classified under organic or inorganic compound? Reason?

By definition in chemistry, an organic compound is one that contains carbon; entire courses are called Organic Chemistry. They deal solely with substances that contain carbon. Natural rubber is indeed classified as an organic compound.It is formed from sap obtained from rubber trees which grow in tropical or sub-tropical environments. It is a polymer of isoprene. Isoprene is made up of carbon and hydrogen atoms. A polymer is a long strand of repeating sub-units....

By definition in chemistry, an organic compound is one that contains carbon; entire courses are called Organic Chemistry. They deal solely with substances that contain carbon. Natural rubber is indeed classified as an organic compound. It is formed from sap obtained from rubber trees which grow in tropical or sub-tropical environments. It is a polymer of isoprene. Isoprene is made up of carbon and hydrogen atoms. A polymer is a long strand of repeating sub-units.  When the sub-units of isoprene combine in a long chain to form natural rubber the structure ends up coiled, which is what gives rubber its elastic qualities. The second link I have posted below shows the basic structure of isoprene with its single and double bonds between the carbon and hydrogen atoms. It also explains in detail how the units of isoprene link up with others by changing a double bond into a single bond, allowing the link with the next isoprene unit.

In addition to the above, in some instances students are referring not to the presence of carbon (which is the requirement in chemistry for declaring a substance "organic"), but to the source of the materials. "Organic", in common usage, tends to mean something that is found in nature as opposed to those substances formulated artificially. Naturally occurring rubber is formed from tree sap. These days, however, most of the rubber used is either fully or partially formed in a lab/factory. Examples of artificial rubbers are neoprene, Thiokol, BUNA-N and BUNA-S. These rubbers, since they are synthetically derived without carbon compounds, are classified as inorganic compounds. Details of their production and uses can be found in the links after this post.