Question

Match the following

(a) Artificial Silk	(i) wool
(b) Natural fiber	(ii) PVC
(c) Thermoplastic	(iii) Bakelite
(d) Thermosetting Plastic	(iv) Rayon

1. (a) - (ii), (b) - (iv),  (c) - (i), (d) - (iii)
2. (a) - (ii), (b) - (iv),  (c) - (iii), (d) - (i)
3. (a) - (iv), (b) - (i),  (c) - (ii), (d) - (iii)
4. (a) - (iv), (b) - (ii),  (c) - (i), (d) - (iii)

Answer 1

Correct Answer - Option 3 : (a) - (iv), (b) - (i),  (c) - (ii), (d) - (iii)

Concept;

Rayon:

• Rayon is a synthetic fiber whose properties are similar to that of silk.
• Rayon is obtained from wood pulp but still a man-made fiber.
• It has a very shiny appearance and hence called artificial silk.

Thermoplastic:

• Thermoplastics are known as polymers that can be melted and recast almost indefinitely.
• They are molten when heated and harden upon cooling.
• When frozen, however, thermoplastic becomes glass-like and subject to fracture.
•  These characteristics, which lend the material its name, are reversible, so the material can be reheated, reshaped, and frozen repeatedly. As a result, thermoplastics are mechanically recyclable.
• Some of the most common types of thermoplastic are polypropylene, polyethylene, polyvinylchloride, polystyrene, Polyethylenetheraphthalate (PET), Teflon, Nylon, PVCs, etc. 

Thermosetting plastic.

• The plastic which keeps its shape and does not soften i.e the plastic which when molded once, can not be softened by heating is called Thermosetting plastic.
• Thermosetting plastics are synthesized by condensation polymerization and have primary bonds between molecular chains and held together by strong cross-links.
• Thermosetting plastics have a high melting point and tensile strength as compared to thermoplastics.
• one of the most common types of thermosetting plastic is Bakelite, Melamine, Polyesters, etc.

Wool

• Wool is a natural fiber obtained from the fur of sheep, yak, etc. 
• It is the fiber used for making clothes for winter. 
• Acrylic is a type of man-made fiber which is also known as the wool of poor man as it is a cheaper alternative to wool.

Explanation:

From above discussion, we can conclude that the correct match is (a) - (iv), (b) - (i),  (c) - (ii), (d) - (iii)

Artificial Silk	Rayon
Natural fiber	Wool
Thermoplastic	PVC
Thermosetting Plastic	Bakelite