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Nylon 6, 6 is a polyamide obtained by the reaction of

1. COOH(CH2)4COOH + NH2C6H4NH2-(p)
2. COOH(CH2)4COOH + NH2(CH2)6NH2
3. COOH(CH2)6COOH + NH2(CH2)4NH2
4. COOH-C6H4COOH-(p) + NH2(CH2)6NH2

Correct answer: COOH(CH2)4COOH + NH2(CH2)6NH2

Solution

Nylon 6,6 is synthesized by the condensation polymerization of adipic acid (COOH(CH2)4COOH) and hexamethylenediamine (NH2(CH2)6NH2), forming amide linkages.

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