Which of the following is a cross-linked polymer?

Identify the correct statement from the following:
$(A)$ Glyptal is made from the monomers ethylene glycol and phthalic acid
$(B)$ Bakelite is used in making electrical switches
$(C)$ Nylon-$2$-nylon-$6$ is a biodegradable polymer

Discuss the main purpose of vulcanisation of rubber.

Which of the following is an example of a fibre?

The monomers of $\text{nylon-}2\text{-nylon-}6$ are:

$Cis-1,4-polyisoprene$ is: