Which of the following statements is/are true?
i. Polyesters are the polycondensation products of dicarboxylic acids and diols.
ii. Dacron or terylene is the best known example of polyesters.
iii. Dacron fibre (terylene) is crease resistant and is used in blending with cotton and wool fibres and also as glass reinforcing materials in safety helmets, etc.
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A.
i, ii and iii
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B.
Only ii
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C.
Only i
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D.
Only iii
Correct Answer:
A. i, ii and iii
Explanation:
The provided statements regarding polyesters are all accurate. Polyesters are indeed synthesized through polycondensation reactions involving dicarboxylic acids and diols. Terylene, also known as Dacron, serves as the most prominent example of this class of polymers. Its properties, such as being highly resistant to creasing and possessing significant durability, make it ideal for textile blends with natural fibers like cotton and wool, as well as for industrial applications like reinforcing safety equipment. Since all three points correctly describe the nature and applications of polyesters, the correct choice is i, ii, and iii.
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