Concept:Condensation of a primary diamine with an aliphatic dicarboxylic acid at elevated temperatures yields a synthetic linear polyamide.
Formula / Reaction:$$\text{HOOC}-(\text{CH}_2)_4-\text{COOH} + \text{H}_2\text{N}-(\text{CH}_2)_6-\text{NH}_2 \xrightarrow{\Delta} -[\text{CO}(\text{CH}_2)_4\text{CONH}(\text{CH}_2)_6\text{NH}]_n- + 2n\,\text{H}_2\text{O}$$
Solution:- Hexanedioic acid (adipic acid) reacts with 1,6-hexamethylenediamine with the elimination of water, forming amide linkages that constitute Nylon-6,6.
Why other options are incorrect:- Polypeptide: Polyamides formed from \(\alpha\)-amino acid monomers.
- Polyvinyl chloride: Formed by the addition polymerization of vinyl chloride.
- Polyester: Formed from the condensation of diols with dicarboxylic acids (forming ester links).
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