The polymer used in Orlon is:

Identify the use of $Buna-S$ from the following.

Match List-$I$ with List-$II$:

List-$I$ (Polymer)	List-$II$ (Used in)
$A$. Bakelite	$I$. Radio and television cabinets
$B$. Glyptal	$II$. Electrical switches
$C$. $PVC$	$III$. Paints and lacquers
$D$. Polystyrene	$IV$. Water pipes

Choose the correct answer from the options given below:

$Cis-1,4-polyisoprene$ is:

Consider the following sequence of reactions.
$2 CH_3Cl + Si$ $\xrightarrow[573 \ K]{Cu} X$ $\xrightarrow{H_2O} Y$ $\xrightarrow{\text{Polymerization}} Z$
The repeating structural unit in $Z$ is

Write down the preparation,properties,and uses of Neoprene.