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Question

Which of the following is a chain-growth polymer ?

A
Nucleic acid
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B
Starch
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C
Polystyrene
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D
Proteins
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Solution

The correct option is C Polystyrene
Nucleic acids are formed when nucleotides are joined together by a condensation reaction that releases pyrophosphate (two phosphate groups bound together).

In case of proteins and starch, a water molecule is released upon condensation of amino acids and carbohydrate.

In case of polystyrene, chain-growth polymerization takes place, where an unsaturated monomer molecule (styrene) add to the active site of a growing polymeric chain one at a time.

Option C is correct.

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