What is the name of the monomer used in the formation of the polymer shown in the image?

Match the polymers given in Column-$I$ with the type of linkage present in them given in Column-$II$.

Column-$I$	Column-$II$
$A$. Terylene	$i$. Glycosidic linkage
$B$. Nylon	$ii$. Ester linkage
$C$. Cellulose	$iii$. Phosphodiester linkage
$D$. Protein	$iv$. Amide linkage
$E$. $RNA$

Which of the following is not a biodegradable polymer?

Which of the following is used in the vulcanization of rubber?

The number average molecular mass of a polymer that contains $15$ molecules with each of mass $8,000$ and $15$ molecules with each of mass $80,000$ is: (in $,000$)

The polydispersity index $(PDI)$ of a polymer is $1.25$. If $\overline{M}_{n}$ is $800$,what is its $\overline{M}_{w}$?