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Polyethylene phthalate is a copolymer containing phthalic acid and ethylene glycol. Modify the molecules to show the product
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1,2 ethylene glycol and phthalic acid condense to give a monomer called glycol monophthalate with elimination of water. The glycol monophthalate has one -OH group at one end and one -COOH group at the other end. They polymerize with elimination of water as hydroxy group takes participate while acid group doesn't to give polyethylene phthalate which is a diestar.

The Modification of structure of ethylene glycol and phthalic acid with elimination of water as shown as below.LH Il CH₂ CH HO 1, 2 ethylene glychol HC CH 2 CH=CH Phthalic aud lux COX OLA OH Ho t H-O-CH₂ - CH2 - 0 020 bu нс сH CH=CH gl

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