Question

What is the difference between catenation and tetravalency?

Answer 1

Catenation is the self-linking property of carbon i.e carbon atoms form bonds with another carbon atom while tetravalency is the property of carbon atom to combine with another atom of another element i.e carbon atoms form  bonds with atoms of other elements.

I hope you understand  

Answer 2

TETRA VALENCY MEANS --------
it is the phenomenona in which carbon forms 4
covalent bond i.e sharing of 4 electrons.
CATENATION-------
it is phenomena in which carbon combines which other carbon atom to form long chains