Question

Match the column I with column II and mark the appropriate choice.

	Column I		Column II
(A)	Buna-S	(i)	Thermosetting
(B)	Polyamides	(ii)	Fibres
(C)	Polyvinyls	(iii)	Elastomers
(D)	Urea-formaldehyde	(iv)	Thermoplastics

• A. (A) $\to$ (iv), (B) $\to$ (iii), (C) $\to$ (i), (D) $\to$ (ii)
• B. (A) $\to$ (ii), (B) $\to$ (i), (C) $\to$ (iii), (D) $\to$ (iv)
• C. (A) $\to$ (iii), (B) $\to$ (ii), (C) $\to$ (iv), (D) $\to$ (i)
• D. (A) $\to$ (i), (B) $\to$ (iv), (C) $\to$ (ii), (D) $\to$ (iii)

Answer 1

The correct option is C (A) $\to$ (iii), (B) $\to$ (ii), (C) $\to$ (iv), (D) $\to$ (i)

Buna$-S$	(iii) Elastomers
Polyamides	(ii) Fibers
Polyvinyls	(iv) Thermoplastic
Urea-formaldehyde	(i) Thermosetting

[A] Elastomers - these are rubber like solids with elastic properties

[B] Fibers - these are thread forming solids which possess high tensile strength and high modulus,

[C] Thermoplastic - these are linear or slightly branched long chain molecules capable of repeatedly softening on heating and hardening on cooling,

[D] Thermosetting polymers are cross-linked and heavily branched molecules which on heating undergo extensive cross-linking in moulds and again become infusible.

The correct option is $\left[C\right]$.