Question:medium

Identify the monomer units used in the preparation of Nylon-6,6.

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Nylon naming rule: Nylon-\(x,y\) indicates the number of carbon atoms in the diamine (\(x\)) and the dicarboxylic acid (\(y\)). For Nylon-6,6 both monomers contain 6 carbon atoms.
Updated On: May 1, 2026
  • Adipic acid and Hexamethylenediamine
  • Terephthalic acid and Ethylene glycol
  • Caprolactam
  • Styrene
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The Correct Option is A

Solution and Explanation

Topic: Polymers (Organic Chemistry)
Step 1: Understanding the Question:
The question asks for the specific starting materials (monomers) used to synthesize the synthetic fiber known as Nylon-6,6.
Step 2: Key Formula or Approach:
Nylon-6,6 is a condensation polymer.
Its name "6,6" refers to the number of carbon atoms present in each of its two monomer units.
Step 3: Detailed Explanation:
1. Adipic Acid: It is a dicarboxylic acid with the formula \(HOOC-(CH_2)_4-COOH\). It contains 6 carbon atoms.
2. Hexamethylenediamine: It is a diamine with the formula \(H_2N-(CH_2)_6-NH_2\). It also contains 6 carbon atoms.
When these two react, they undergo condensation polymerization, losing water molecules to form amide (\(-CONH-\)) linkages.
The resulting polymer is a polyamide named Nylon-6,6.
Step 4: Final Answer:
The monomers are Adipic acid and Hexamethylenediamine.
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