Give the likely structure of the polymer obtained in each of the following reactions. Also, tell whether these reactions are examples of chain-reaction or step-reaction polymers.

Nylon -6, step-reaction polymer

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Nylon-6, chain-reaction polymer

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Dacron, step- reaction polymer

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Glyptal, chain-reaction polymer

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Solution

The correct option is A Nylon -6, step-reaction polymer
The places of polymer formation by repeated condensation reaction between two bi functional on trifunctional monomel unit by elimination of small molecules like $H_{2} O, N H_{3}, C O_{2}$ is known as condensation polymerization and the polymer formed by this reaction is called condensation Polymer
Examle be- Terylene ,Bakelite, Nylon.6,Cellolose etc
$n N H_{2} (C H_{2})_{6} N H_{2} + n C O O H (C H_{2})_{4} C O O H \to - [N H (C H_{2})_{6} N H C O (C H_{2})_{4} C O -] + n H_{2} O$
The Polymer Nylon 6 is obtain by healing caprolactam will water at high temperature.
(Refer image)
And the Nylon-6 polymer is fromed by step growth polymermization process where a single monomel is stepwise repeatedly condensed.
Hence, Nylon-6 ans step Reaction Polymer is the correct option for the given Polymer Reaction.

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