Anhydrous sample of ferric chloride is prepared by heating:

Choose the correct statement from the following with reference to the inert pair effect.

$Si(OH)_4$ acid is produced at the end of hydrolysis of $SiCl_4$. Is this statement true or false?

Assertion $(A)$: The maximum covalency of $Si$ and $Ge$ is $6$ but that of carbon is $4$.
Reason $(R)$: Due to the presence of $d$-orbitals in $Si$ and $Ge$,both these elements can undergo $sp^3d^2$ hybridisation and covalency of $6$ is possible. Carbon has no $d$-orbitals in it and hence its covalency is $4$.
The correct answer is:

What do you understand by $(a)$ inert pair effect,$(b)$ allotropy,and $(c)$ catenation?

Choose the $INCORRECT$ statement.