What are the compounds used to obtain nylon salt?

Step-by-step solution

Nylon 6,6 salt forms through the reaction between adipic acid ( HOOC-(CH₂)4-COOH ) and hexamethylenediamine ( H2N-(CH₂)6-NH₂ ). This salt undergoes condensation polymerization to yield the final polyamide. Hydrogen bonding stabilizes the crystal lattice in nylon 6,6, contributing to its high melting point and mechanical strength. Option A employs a monoamine, which cannot form the required repeating unit. Option B uses terephthalic acid, which produces polyesters rather than nylons. Option D involves a hydroxy acid