Question

Dacron is an excellent cloth which is resistant to wrinkles and moth. It is a synthetic polyester fibre made from:
(A) Vinyl pyridine
(B) Caprolactam and alcohol
(C)Terephthalic acid and ethylene glycol
(D)Phthalic acid and cellulose

Answer 1

Hint To answer this question we should be aware of the method used to obtain Dacron. Dacron is also known as terylene. It is a type of polyester which truly revolutionized the cloth industry.

Complete step by step answer:
Polymers are the high molecular weight compounds whose structure is made up of a large number of repeating units. The repeating units are also known as monomers which are obtained from low molecular weight simple compounds.
The process of conversion of monomers to polymers is known as polymerization.
The polymers that are formed by combination of monomers with elimination of simple molecules such as water and ethanol is known as condensation polymer. Condensation polymers are also known as step growth polymers. There are two types of condensation polymers: polyesters and polyamides.
Dacron is a polyester. It is also known as terylene. It is obtained by heating ethylene glycol with dimethyl terephthalate at ${{300}^{\circ }}C$ in the presence of metal oxides. The polymer melt can be spun into fibres and combined with naturally occurring fibers such as cotton.

The combination of cotton and polyester yields a fabric which dries quickly without wrinkling, but still retains the cool and comfort of 100%.
From the above discussion, we can conclude that option C (terephthalic acid and ethylene glycol) is the correct answer.

Note: Dacron is a strong fiber which is very elastic in nature and has the property of resist creasing. The cloth from the combination of this fibre dries quickly and does not get damaged when bleaching powder or any other cleaning agent is used. It is widely used in clothes and to make bottles.