Correct Answer: Nylon 66

Solution : The correct option is Nylon 66 .

The polymer formed by the reaction of hexamethylene diamine with adipic acid is known as "Nylon 66". It is a synthetic polyamide made up of repeating units produced from these two monomers. Nylon 66 is well-known for its strength, durability, and wide range of uses, which include textiles, industrial products, and engineering components. The reaction can be represented as follows: Hexamethylene diamine + Adipic acid → Nylon 66 + Water.