Identify the use of $Buna-N$ from the following:

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A:$ Dacron is an example of polyester polymer.
Reason $R:$ Dacron is made up of ethylene glycol and terephthalic acid monomers.
In the light of the above statements,choose the most appropriate answer from the options given below.

In the viscose process,the solvent for cellulose consists of:

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

List-$I$ (Name of polymer)	List-$II$ (Uses)
$A$. Glyptal	$I$. Flexible pipes
$B$. Neoprene	$II$. Synthetic wool
$C$. Acrilan	$III$. Paints and Lacquers
$D$. $LDP$	$IV$. Gaskets

Choose the correct answer from the options given below:

Which one of the following is a biodegradable polymer?

On complete hydrogenation,natural rubber produces