The synthetic rubber neoprene is a .....

Which of the following polymers contains an ester linkage?

Which biodegradable polymer was first used for post-operative stitches?

Consider the Assertion and Reason given below.
Assertion $(A):$ Ethene polymerized in the presence of Ziegler-Natta catalyst at high temperature and pressure is used to make buckets and dustbins.
Reason $(R):$ High density polymers are closely packed and are chemically inert.
Choose the correct answer from the following:

Bakelite is an example of

The correct match between Item-$I$ and Item-$II$ :

Item-$I$	Item-$II$
$a$. Natural rubber	$I$. $1,3-$butadiene $+$ styrene
$b$. Neoprene	$II$. $1,3-$butadiene $+$ acrylonitrile
$c$. Buna$-N$	$III$. Chloroprene
$d$. Buna$-S$	$IV$. Isoprene