Which from following polymers does NOT contain either —COO— or —CO—NH— linkage in it?

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Perspex is polymethyl methacrylate (PMMA), which contains an ester group ( $—COO—$ ).

Polyacrylamide is an addition polymer of acrylamide, which contains an amide group ( $—CONH_{2}$ ).

Glyptal is a polyester formed from ethylene glycol and phthalic acid, which contains ester linkages ( $—COO—$ ).

Thermocol is polystyrene, which is an addition polymer of styrene. It is a pure hydrocarbon polymer and does not contain any ester or amide linkages.

Answer: Thermocol

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