The Novolac polymer has mass of $963 \mathrm{g}$. The number of monomer units present in it are

Which of the following sets are correct regarding polymer:

(A) Copolymer : Buna-$\mathrm{S}$

(B) Condensation polymer : Nylon-$6,6$

(C) Fibres : Nylon-$6,6$

(D) Thermosetting polymer : Terylene

(E) Homopolymers : Buna-$\mathrm{N}$

Choose the correct answer from given options below

Match List - I with List - II.

Choose the correct answer from the options given below

Given below are two statements, one is Assertion and other is Reason.

Assertion: Natural rubber is a linear polymer of isoprene called cis-polyisoprene with elastic properties.

Reason: The cis-polyisoprene molecules consist of various chains held together by strong polar interactions with coiled structure.

In the light of the above statements, choose the correct one from the options given below

Given below are two statements: one is labelled as

Assertion $\mathrm{A}$ and the other is labelled as Reason $\mathrm{R}$.

Assertion $\mathrm{A}$: Dacron is an example of polyester polymer.

Reason $\mathrm{R}$: Dacron is made up of ethylene glycol and terephthalic acid monomers.

In the light of the above statements, choose the most appropriate answer from the options given below.