Question

Synthetic fibres are also called artificial or human-made fibres.
(A) True
(B) False

Answer 1

Hint: There are two types of fibres. One of them is obtained naturally from sources like animals and plants. The other type of fibres is synthesized by humans by use of specific reagents.

Complete step by step solution:
We know that monomers combine to give macromolecules and those macromolecules are known as polymers. Now, these polymers can be divided into certain categories depending upon molecular forces.
- Fibers are such a category of polymers in which they have high tensile strength and high modulus. We can say that fibres are the thread forming solids. This ability of the fibres is due to strong intermolecular forces between the molecules which include hydrogen bonding.
- The fibres can also be divided into two categories depending upon its origin.
- If the fibres are obtained naturally from natural sources, then the fibres are called natural fibres. e.g. cotton and wool are obtained naturally from various plants so they are natural fibres.
- Certain fibres are there which we cannot obtain from natural sources like plants, animals or from the environment. They need to be synthesized by our efforts. As we humans synthesize them by providing certain reaction conditions and with proper reagents, those fibres are also called human-made fibres. They are also known as artificial fibres.
e.g. Certain polyamides (Nylon-6,6) and polyesters (Terylene) are good examples of synthetic fibres.
Therefore, we can say that the given statement is true.

So, the correct answer is (A).

Note: Nylon-6,6 can be synthesized artificially by condensation polymerization of hexamethylenediamine and adipic acid under high pressure and temperature about 553K. Nylon-6 can be synthesized by heating caprolactam in the water at high temperatures.