Which of the following polymers is used as a surgical suture?

The ‘mercerised cellulose’ is chemically prepared by

Bulletproof helmets are made from -

Which one of the following structures represents the neoprene rubber?

Neoprene is the polymer of a monomer $X$. The $IUPAC$ name of $X$ is

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.