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

Step-by-step solution

To identify which polymer lacks both ester (—COO—) and amide (—CO—NH—) linkages, examine the structural composition of each: Perspex (polymethyl methacrylate) contains ester linkages from its methyl methacrylate monomer CH₂=C(CH₃)COOCH₃ , forming [— CH₂—C(CH₃)(COOCH₃)— ]_n . Polyacrylamide includes amide linkages derived from acrylamide CH₂=CHCONH₂ , yielding [— CH₂—CH(CONH₂)— ]_n . Glyptal, a polyester resin synthesized from phthalic acid and glycerol, inherently contains ester linkages. Thermocol (polystyrene) po