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B- rayon
3. an ester is a chemical compound derived from an acid (organic or inorganic) in which at least one –OH (hydroxyl) group is replaced by an –O–alkyl (alkoxy) group. Usually, esters are derived from a carboxylic acid and an alcohol.
4.Polyethylene terephthalate
5.Spandex
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1.ester ia a chemical compound derived from an acid
2.polyethylene Terephthalate
3. spandex
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