The synthetic fibre A is chemically a polyamide whereas the synthetic fibre B contains
number of ester groups. Another synthetic fibre C is made of a polymer D which consist
number of glucose units joined one after the other.
a. Which fibre could be i. terylene ii. rayon, and i. nylon?
b. Name the polymer D.
C. Which fibre (A, B or C) is prepared from a natural raw material?
d. Which fibre (A, B or C) contains the same type of groups as those in a PET jar?
Answers
Answer:
(i) terylene could be the synthetic fibre B which contains a large number of ester groups.
(ii) Rayon could be the synthetic fibre C which is made of polymer D containing glucose.
(iii) Nylon could be the fibre A which is chemically a polyamide is nylon. It is the first fully synthetic fibre. It was prepared from coal, water and air.
(b) Polymer D is Cellulose. A polymer is made of many repeating units. Polymers also occur in nature. For example, cotton is a natural polymer which is made from the cellulose. Cellulose is made up of a large number of glucose units.
(c) Fibre C is prepared from a natural raw material. Fibre C is Rayon. Rayon is obtained by the chemical treatment of wood pulp or cellulose. It is the man-made fibre which is regarded as artificial silk.
(d) The fibre B which is terylene contains the same type of groups as those in a PET jar. Terylene and PET are both polyesters.
Explanation: