Question

Which of the following is wrong?
A.PMMA is called plexiglass
B.PTFE is called teflon
C.SBR is natural rubber
D.LDPE is called low density polythene

Answer 1

:Hint: Each material given in the options is one or another polymer. First of all elongate the full forms of each polymer. This will give a brief idea about how and of what substance these polymers are made. This structural information will tell about their properties.

Complete answer:
Let us analyze each of the statements carefully. The first statement states that PMMA is called plexiglass. PMMA stands for poly(methyl methacrylate). It is a transparent thermoplastic. It is used as an alternative to glass in sheet form which is shatter resistant. It is also called acrylic glass or plexiglass which is its trade name. So this statement is correct.
Next statement states that PTFE is called teflon. PTFE stands for polytetrafluoroethylene. It is a synthetic fluoropolymer of tetrafluoroethylene. It is a fluorocarbon solid because it has high molecular weight and consists mainly of carbon and fluorine. PTFE’s developer Chemours spinned it under the brand of teflon. So this statement is also correct.
Next statement states that LDPE is called low density polythene. LDPE is a thermoplastic and is made from a monomer of ethylene. It is the first grade of polythene made using a high pressure process via free radical polymerization. The name LDPE itself stands for low density polythene. So this statement is also correct.
Now the last statement states that SBR is natural rubber. SBR stands for styrene-butadiene or styrene-butadiene rubber. SBR is derived from styrene and butadiene. SBR is a synthetic polymer as it is derived from two other polymers. Such a polymer is known as copolymer. Therefore this statement is wrong.

So, option C is the correct answer.

Note:
There was a shortage of rubber during World War I and II. So a synthetic rubber research took place in Europe and the United States. The result was production of SBR in 1929 by German chemists.