Which of the following sets are correct regarding polymer:
(A) Copolymer : Buna-S
(B) Condensation polymer : Nylon-6, 6
(C) Fibres : Nylon-6, 6
(D) Thermosetting polymer : Terylene
(E) Homopolymers : Buna-N
Choose the correct answer from given options below

We need to check each statement about polymers.

Statement (A): Copolymer - Buna-S

Buna-S is a copolymer of 1,3-butadiene and styrene. Since it is made from two different monomers, it is indeed a copolymer.

(A) is correct.

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

Nylon-6,6 is formed by the condensation polymerization of hexamethylenediamine and adipic acid, with the elimination of water molecules. It is a condensation polymer.

(B) is correct.

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

Nylon-6,6 has strong intermolecular hydrogen bonding due to the amide ($$-CONH-$$) groups, giving it high tensile strength. It is widely used as a fibre in textiles and ropes.

(C) is correct.

Statement (D): Thermosetting polymer - Terylene

Terylene (polyethylene terephthalate, PET) is a thermoplastic polymer, not a thermosetting polymer. Thermoplastic polymers can be remoulded on heating, while thermosetting polymers cannot. Terylene can be melted and reshaped, so it is thermoplastic.

(D) is incorrect.

Statement (E): Homopolymers - Buna-N

Buna-N is a copolymer of 1,3-butadiene and acrylonitrile. Since it is made from two different monomers, it is a copolymer, not a homopolymer.

(E) is incorrect.

Conclusion: Statements (A), (B), and (C) are correct.

The correct answer is Option A: (A), (B) and (C) are correct.