Question

Which monomer is used in preparation of orlon?
A.$C{F_2} = C{F_2}$
B.$C{H_2} = CH - CN$
C.$C{H_2} = CH - Cl$
D.$C{H_2} = CH - OH$

Answer 1

Hint:
Polymerisation is the chemical process of monomers joining together to form polymers, often it takes many thousands of monomers to make a single polymer.We have to define the structure of the polymer orlon and the reaction involved in the making ($nC{H_2} = CHCN \to [ - C{H_2} - CHCN - ]n$ ) so that we can compare it with the options and get the answer ( which in this case is vinyl nitrile ).

Complete step by step answer:
The process talked about is called polymerisation. In this process two or more than two monomers ( substantial compounds which are united in forming the polymers ) are combined to form various different kinds of polymers. These processes are carried out by different methods depending upon the nature of the polymer formed and the type of the monomers used in the reaction.
Here in the question the polymer which is talked about is orlon. This is a polymer made by the long chain reaction by the acrylonitrile in which the simultaneous double bonds are broken to form a chain of monomers which in addition forms the long polymers required. It has a fabric-like texture.
The given reaction for the derivation of orlon is :
$nC{H_2} = CHCN \to [ - C{H_2} - CHCN - ]n$
Now from that we can clearly see that the acrylonitrile is used in the process of the formation of the orlon.
Therefore, the answer would be option B , $C{H_2} = CH - CN$ .

Note:
The central carbon breaks their double bonds to form a new bond, a new additional carbon bond. Orlon is a brand of synthetic, acrylic textile fibre of light weight and wrinkle resistant fabric. It is a widely used artificial fabric.