ExamGOAL
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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.

23
Subjective

Out of chain growth polymerisation and step growth polymerisation, in which type will you place the following.

Explanation

Chain growth polymerisation, as there is no loss of small molecules like water; methanol etc.

24
Subjective

Identify the type of polymer given in the following figure.

Explanation

Cross-linked or network polymer.

25
Subjective

Identify the polymer given below.

Explanation

The given polymer is formed by', 1, 4--addition of 2- methylbuta- 1,3- diene (isoprene) and stereochemistry is 'cis' throughout. Therefore, the given polymer is 'cis'- polyisoprene i.e., natural rubber.