Give reasons for the following

1.  CCl4 is immiscible in water, whereas SiCl4 is easily hydrolysed.

2.  Carbon has a strong tendency for catenation compared to silicon.

(a) Carbon tetrachloride (CCl4) is a covalent compound while H2O is a polar compound. CCl4 does not form H-bond with water molecule. Hence, it is immiscible in water.
Further more, CCl4 is not hydrolysed by water because of the absence of d-orbitals in carbon while SiCl4 is readily hydrolysed by water.
SiCl4+4H2OSi(OH)4Silicic acid+4HCl
The hydrolysis of SiCl4 occurs due to coordination of OH- with empty 3d orbitals in silicon atom of SiCl4 molecule.
(b) Carbon atmos have the tendency to link with one another through covalent bonds to form chains and rings. This property is called catenation. This is because C-C bonds are very strong.
Down the group, the size increases and electronegativity decreases and thereby, tendency to show catenation decreases. Thus, carbon has a strong tendency for catenation as compared to silicon.