Which of the following polymers does not involve cross linkages?

Bakelite

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Melamine

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Polythene

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Vulcanized rubber

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Solution

The correct option is C Polythene
Cross-linked polymers are usually formed from bifunctional and trifunctional monomers and contain strong covalent bonds between various linear polymer chains.
For example, bakelite, melamine, vulcanized rubber.

Polythene is a linear polymer of monomer ethene.

$n C H_{2} = C H_{2} \to n [- C H_{2} - C H_{2} -] \to {[- C H_{2} - C H_{2} -]}_{n}$
Ethene Repeating Polythene
unit polymer

Hence, option C is correct.

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