Nylon $6, 6$ is:

Which of the following set of polymers are used as fibres?
$(i)$ Teflon
$(ii)$ Starch
$(iii)$ Terylene
$(iv)$ Orlon

The polymer used for optical lenses is

Which of the following statements is false?

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 correct regarding $Terylene$?