Catenation i.e., linking of similar atoms depends on the size and electronic configuration of atoms. The

the tendency of catenation in group 14 elements follows the order-

1.  C>Si>Ge>Sn

2.  C>>Si>GeSn

3.  Si>C>Sn>Ge

4.  Ge>Sn>Si>C

Hint: As the size of the element increases the tendency of catenation decreases.

The tendency to form long open or closed atom chains by a combination of some atoms in themselves is known as catenation.
The catenation is maximum in carbon and decreases down the group.
This is due to the high bond energy of C-C bonds. Down the group, size increases and electronegativity decreases,
thereby, a tendency to show catenation decreases.