The synthetic fibre A is chemically a polyamide whereas the synthetic fibre B contains a large number of ester groups.

(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.