The composition of common glass is:

Under hydrolytic conditions,the compounds used for preparation of linear polymer and for chain termination,respectively,are

Silicon chloroform is prepared by

Match List-$I$ with List-$II$.

List-$I$	List-$II$
$A$. Coke	$I$. Carbon atoms are $sp^3$ hybridised
$B$. Diamond	$II$. Used as a dry lubricant
$C$. Fullerene	$III$. Used as a reducing agent
$D$. Graphite	$IV$. Cage like molecules

Choose the correct answer from the options given below:

$A$ tetravalent element forms monoxide and dioxide with oxygen. When air is passed over the heated element $(1273 \ K)$,producer gas is obtained. The monoxide of the element is a powerful reducing agent and reduces ferric oxide to iron. Identify the element and write the formulas of its monoxide and dioxide. Write chemical equations for the formation of producer gas and the reduction of ferric oxide with the monoxide.

Rationalise the given statements and give chemical reactions:
$1$. Lead $(II)$ chloride reacts with $Cl_2$ to give $PbCl_4$.
$2$. Lead $(IV)$ chloride is highly unstable towards heat.
$3$. Lead is known not to form an iodide,$PbI_4$.