Question

The hard, plastic covers of telephones are made of polymers of:
A.Styrene
B.Acrylonitrile
C.Phenol – formaldehyde
D.Fluoromethane

Answer 1

All the compounds mentioned above are monomers. Under right conditions, they undergo polymerization and form long chained polymers. The properties of these polymers vary depending on the nature of the monomer, the type of branching etc. Each polymer has a specific set of use cases in accordance to its properties.

Complete step by step answer:
Phones covers are made of hard plastics. This is to ensure the durability and usability of the phone last for a longer period of time. some of the hard plastics used in the manufacture of phone covers are polycarbonate, polyurethane, polypropylene, Bakelite, etc.
From the abovementioned hard plastics, the monomers for only Bakelite have been mentioned in the options provided to us. Bakelite is produced in a condensation reaction. phenol and formaldehyde are reacted with a certain filler material under the conditions of high pressure and temperature. The chemical reaction for the production of Bakelite can be given as follows:

Hence, Option C is the correct option.

Note:
The different properties of Bakelite include resistance to heat, destructive solvents and scratches as well. It is also a good insulator and is not very flexible.