18
MCQ (Multiple Correct Answer)
Which of the following polymers have vinylic monomer units?
A
Acrilan
B
Polystyrene
C
Nylon
D
Teflon
19
MCQ (Multiple Correct Answer)
Vulcanization makes rubber ............ .
A
more elastic
B
soluble in inorganic solvent
C
crystalline
D
more stiff
20
Subjective
A natural linear polymer of 2-methyl-1, 3-butadiene becomes hard on treatment with sulphur between 373 to 415 K and -S-S-bonds are formed between chains. Write the structure of the product of this treatment?
Explanation
The product is called vulcanised rubber. Its structure is
21
Subjective
Identify the type of polymer
$\mathrm{-A-A-A-A-A-A-}$
Explanation
Homopolymer as it contains only one type of monomer units. i.e., only A monomer units.
22
Subjective
Identify the type of polymer $$ -\mathrm{A}-\mathrm{B}-\mathrm{B}-\mathrm{A}-\mathrm{A}-\mathrm{A}-\mathrm{B}-\mathrm{A}- $$
Explanation
Copolymer, as it contains more than one type of monomer units. Here, $A$ and $B$ are two types of monomer units.