Which one of the following is a chain growth polymer?
A
Starch
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B
Nucleic acid
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C
Polystyrene
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D
Protein
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Solution
The correct option is B Polystyrene
Polystyrene is a chain growth polymer. Polystyrene results when styrene monomers interconnect. In the polymerization, the carbon-carbon pi bond is broken and a new carbon-carbon single bond is formed, attaching another styrene monomer to the chain. The newly formed sigma bond is much stronger than the pi bond that was broken, thus it is very difficult to depolymerize polystyrene.