Which of the following is an example of a fibre?

In bakelite,the rings are joined to each other through

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:

Name the accelerator used to introduce a network of crosslinks in elastomers.

Which of the following statements about neoprene is false?

Assertion : Bakelite is a thermosetting polymer.
Reason : Bakelite can be melted again and again without any change.