Draw the structures of ${\mathrm{BCl}}_3.{\mathrm{NH}}_3$ and ${\mathrm{AlCl}}_3$ (dimer).

Explain why the following compound behaves as Lewis acid?

${\mathrm{BCl}}_3$

Explain why the following compound behaves as Lewis acid?

${\mathrm{AlCl}}_3$

Give reason for the following:

${\mathrm{CCl}}_4$ is immiscible in water, whereas ${\mathrm{SiCl}}_4$ is easily hydrolysed.

Give reason for the following:

Carbon has a strong tendency for catenation compared to silicon.

Explain the following :

${\mathrm{CO}}_2$ is a gas whereas ${\mathrm{SiO}}_2$ is a solid.

Explain the following :

Silicon forms ${\mathrm{SiF}}_6^{2-}$ ion whereas corresponding fluoro compound of carbon is not known.