Which of the following polymers contains the $-CO-NH-$ linkage in it?

Which one of the following structures represents the neoprene rubber?

Name the polymer used in laminating sheets and give the name of monomeric units involved in its formation.

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:

Which of the following is $NOT$ true for Terylene?

Which one of the statements regarding $X$ is not correct?
$3$-Hydroxybutanoic acid + $3$-Hydroxypentanoic acid $\longrightarrow X$