Question

The polyester is made up of
(A) Nylon
(B) Rayon
(C) Ester
(D) Cotton

Answer 1

Polyester is made up of two words Poly and Ester, where Poly means many. Polyester is a fibre and fibres can broadly be classified into two categories i.e. Natural and synthetic.

Complete answer:
Natural fibres are those which are obtained directly from nature( Plants and Animals) such as Jute, Cotton , Hemp, Silk etc.
Synthetic Fibres are those which do not exist naturally but are made by humans in labs or factories. Examples of such fibres are: Nylon, Rayon, Kevlar, latex, acrylic , polyester.
Here Cotton can not be the answer because we know cotton is obtained from plants and thus is a natural fibre and remaining three are synthetic fibres.
Since Polyester is a synthetic fibre, where poly means many. i.e. many small units join to form a bigger unit known as polymer.
Polymers are long chains of monomers which are stronger and stable than its single unit known as monomers. eg. of polymers are Polyethene, Polyester, Polyadenylic acid etc.
Since Rayon and Nylon are monomers, and their polymers would be known as poly rayon and poly nylon thus they cannot be the answer.
And polyester is a polymer. That means many ester compounds join together to form a long chain of ester which is known as Polyester.

Thus polyester is made up of Esters.

Note:
Polyesters can be synthetic and natural both, but most of them are synthetic and are non-biodegradable. Polymers are made in order to have more stability, strength, better quality and also to form a new product.