Identify the fibre family: which of the following fibres are polyamides?

Introduction / Context:
Classifying fibres by polymer chemistry helps predict dyeing behaviour, thermal properties, and end-use. Polyamide fibres are known generically as nylon and are used in textiles, cords, and engineering applications.

Given Data / Assumptions:

• Dacron is polyester (polyethylene terephthalate).
• Rayon is regenerated cellulose.
• Orion (more commonly Orlon) is acrylic (polyacrylonitrile-based).
• Nylon is the generic name for polyamides.

Concept / Approach:
Polyamides contain amide linkages in the backbone, conferring strong hydrogen bonding, good abrasion resistance, and toughness. Nylon fibres (e.g., nylon-6, nylon-66) are the canonical polyamide fibres.

Step-by-Step Solution:
Map brand/common names to polymer families.Recognise nylon as polyamide by definition.Select “Nylon.”

Verification / Alternative check:
Textile standards list nylon under polyamide; Dacron under polyester; rayon under cellulosics; Orlon under acrylics.

Why Other Options Are Wrong:
Dacron: polyester, not polyamide.Rayon: regenerated cellulose.Orion/Orlon: acrylic.Kevlar is an aramid (aromatic polyamide) fibre but is not the generic “nylon” used in common apparel context; the question targets the standard textbook match, nylon.

Common Pitfalls:
Confusing trade names with polymer families; overlooking that aramids are a specialised subset of polyamides.

Final Answer:
Nylon