Which of the following polymers contains an amide linkage?

Explain the preparation of polyacrylonitrile and also write down its uses.

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:

Ethylene-propylene rubber $(EPR)$ is:

Given below are two statements,one is Assertion $(A)$ and the other is Reason $(R).$
Assertion $(A):$ Natural rubber is a linear polymer of isoprene called cis-polyisoprene with elastic properties.
Reason $(R):$ The cis-polyisoprene molecules consist of various chains held together by strong polar interactions with a coiled structure.
In the light of the above statements,choose the correct one from the options given below:

Identify the monomers used in the manufacture of glyptal $(X)$, dacron $(Y)$ and nylon $2$-nylon $6$ $(Z)$.