Question

The synthetic fibre A is chemically a polyamide whereas the synthetic fibre B contains a large number of ester groups. another synthetic fibre C is made of a polymer D which consists of a number of glucose units joined one after the other. 

(a) Which fibre could be (i) terylene (ii) rayon and 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?

Answer 1

(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.