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.  $\mathrm{C}>\mathrm{Si}>\mathrm{Ge}>\mathrm{Sn}$

2.  $\mathrm{C}>>\mathrm{Si}>\mathrm{Ge}\approx \mathrm{Sn}$

3.  $\mathrm{Si}>\mathrm{C}>\mathrm{Sn}>\mathrm{Ge}$

4.  $\mathrm{Ge}>\mathrm{Sn}>\mathrm{Si}>\mathrm{C}$

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.

$\mathrm{C}>>\mathrm{Si}>\mathrm{Ge}\approx \mathrm{Sn}>\mathrm{Pb}$

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.