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Nylon-66 is an example of:

1. polypropylene
2. polyester
3. polyamide
4. polystyrene

Correct answer: polyamide

Solution

Nylon-66 is formed by condensation polymerization and its chain contains repeating amide (–CONH–) groups, which is the defining feature of polyamides. Therefore, it belongs to the polyamide family, not polyester or the other listed polymers.

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