What is reason behind compound building ability of Carbon?
Complex branching ability of element
There is a huge number of ways in which they can be attached to the carbon-atom branches, and each variation makes a molecule of a different compound.
The astounding compound-forming ability of the element comes from the capacity of its atoms bind to each other not only in straight chains but in complex branchings, like the branches of a tree.
They can join in a “head-to-tail” structures to make rings of carbon atoms.
The element has practically no limit to the number or complexity of the branches or the number of rings that can be attached to them, thus making it unique as there is no limit to the number of different molecules that can be formed.