Adipic acid serves as a key intermediate in making which polymer?

Introduction / Context:
Monomer identification is crucial for understanding polymer families. Adipic acid is a dicarboxylic acid that pairs with a diamine to form a condensation polyamide via amide linkages.

Given Data / Assumptions:

• Nylon-6,6 is synthesized from adipic acid and hexamethylenediamine.
• Other listed polymers use different monomer chemistries.

Concept / Approach:
Condensation polymerisation joins adipic acid (HOOC–(CH2)4–COOH) with the diamine to form repeating –CO–NH– bonds and release small molecules (e.g., water). PMMA needs methyl methacrylate; polystyrene needs styrene; Bakelite is from phenol and formaldehyde.

Step-by-Step Solution:
Match adipic acid to nylon-6,6.Eliminate polymers with mismatched monomers.

Final Answer:
Nylon-6,6 (polyamide 66)