Which of the following are polyesters?
Cotton, Terylene, Nylon, PET, Rayon, Acrylic

Explanation

To determine which of the following are polyesters, we need to first understand what a polyester is. A polyester is a type of polymer that is formed from the reaction of an alcohol and a carboxylic acid, resulting in repeating units of esters.

Now, let’s analyze each of the options provided:

1. **Cotton**: Cotton is a natural fiber made from the cotton plant. It is primarily composed of cellulose, which is not a polyester. Therefore, cotton is **not a polyester**.

2. **Terylene**: Terylene is a synthetic fiber made from polyethylene terephthalate (PET), which is a type of polyester. Therefore, Terylene **is a polyester**.

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