why carbon and it's compound have …

Carbon occurs in more than 10 million compounds. None of the other elements in the periodic table is known to form such a large number of compounds. The most important property of carbon that allows it to be a part of so many compounds is catenation. Catenation is the ability of an element to combine with itself through covalent bonds.

Hence, Carbon has a unique ability to combine with other atoms of carbon to form long chains and rings. Carbon forms very strong bonds with itself. Hence, the chains and rings formed by carbon through catenation are not only long, but also very stable.

Thus the number of carbon compounds is so vast that there is one branch of chemistry dedicated only to the study of carbon and its compounds. This branch is known as organic chemistry