Which of the following is correctly matched?

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

List-$I$ (Polymers)	List-$II$ (Commercial names)
$A$. Phenol-formaldehyde resin	$I$. Glyptal
$B$. Copolymer of $1,3$-butadiene and styrene	$II$. Novolac
$C$. Polyester of glycol and phthalic acid	$III$. Buna-$S$
$D$. Polyester of glycol and terephthalic acid	$IV$. Dacron

Choose the correct answer from the options given below.

Which of the following is a polyamide?

The structure given below is an example of
$I$. $A$ condensation and biodegradable polymer.
$II$. $A$ biodegradable and thermoplastic polymer.
$III$. $A$ biodegradable and thermosetting polymer.
$IV$. $A$ polyester and thermoplastic polymer.

Which is not a monomer for a high molecular mass silicone polymer?

$A$ polymer sample contains $3$ molecules of molar mass $10^3$,$3$ molecules of molar mass $500$,and $4$ molecules of molar mass $200$. What is its weight average molecular mass?