Which from following polymers contain - CO − NH − linkage in it?.

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Urea formaldehyde resin is a condensation polymer formed from urea ( $N H_{2} - CO - N H_{2}$ ) and formaldehyde ( $HCHO$ ). Its structure contains the $- NH - CO - NH - C H_{2} -$ repeating unit, which includes the $- CO - NH -$ (amide) linkage.

Glyptal is a polyester containing $- CO - O -$ linkages.

Polycarbonate contains carbonate ( $- O - CO - O -$ ) linkages.

Thermacol (polystyrene) is an addition polymer containing only carbon-carbon bonds in its backbone.

Answer: Urea formaldehyde resin

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