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Answer

Polyester is a category of polymers that contain the ester i.e. -COO- functional group in their main chain.

Answer
Ester group means RCOOR' where the R ,R' are alkyl groups. So the polymer ( usually addition polymer) of the ester is called polyester eg:terylene or Dacron,polythene, terpthalic acid,etc
Answer

Poly means many

Ester is RCOOR (R alkyl group or allyl group)

When the Ester groups are arranged in chains to form a long chain of molecules it s known as Polyester.

Eg. Polyethylene terpthalate.(PET) is used to make the bottles which we use in kitchen and to drink liquids.

Answer

The functional group ester is present in polyester.Commonly it is known as polyethylene terephthalate (PET).Polyester is type   of polymers

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