Nylon formation from diacid and diamine

Steps:

• Nylon is a polyamide formed by condensation polymerization.
• It requires a dicarboxylic acid (two -COOH groups) and a diamine (two -NH2 groups).
• The given formulas are HOOC-CH2-COOH (diacid) and H2N-CH2-NH2 (diamine) for all options.
• These react via amide linkage to form the nylon polymer chain.

Why C is correct:

• Option C pairs the dicarboxylic acid HOOC-CH2-COOH with diamine H2N-CH2-NH2, matching the standard monomers for nylon synthesis via condensation.

Why the others are wrong:

• A uses identical monomers but mislabels chain length for typical nylon.
• B incorrectly implies mono-functional compounds, preventing polymerization.
• D swaps acid and amine roles, breaking amide formation.

Final answer: C