Who discovered the allotrope of carbon known as fullerene?

Match the following:

List-$I$ (Compound)	List-$II$ (Use)
$A$. Kieselghur	$I$. Chromatographic material
$B$. Silica gel	$II$. Softening of hard water
$C$. $ZSM-5$	$III$. Filtration plants
$D$. Hydrated zeolites	$IV$. To convert alcohol directly into gasoline

Give reasons for the following:
$(i)$ $CCl_4$ is immiscible in water,whereas $SiCl_4$ is easily hydrolyzed.
$(ii)$ Carbon has a strong tendency for catenation compared to silicon.

Silicon dissolves in excess of $HF$ due to the formation of:

Which of the following compounds is the most volatile among $CH_4, SiH_4, GeH_4, SnH_4$?

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: