In polymer Buna-$S$,'$S$' stands for :-

What is the structural difference between $HDP$ and $LDP$? How does the structure account for their different behavior,nature,and usage?

Phenol and formaldehyde undergo condensation to give a polymer $(A)$ which on heating with formaldehyde gives a thermosetting polymer $(B)$. Name the polymers. Write the reactions involved in the formation of $(A)$. What is the structural difference between the two polymers?

The name 'nylon' is associated with the discovery of the polymer in which two cities?

Consider the following statements:
Statement-$I$: Nylon $6$ is a condensation copolymer.
Statement-$II$: Nylon $6, 6$ is a condensation polymer of adipic acid and hexamethylenediamine.
The correct answer is:

Which of the following is a cross-linked, thermosetting polymer?