Question

The monomers of Nylon-6,6 are

• A. Adipic acid and hexamethylenediamine
• B. Caprolactam
• C. Ethylene glycol and terephthalic acid
• D. Styrene and butadiene

Hint:

Remember that the numerical designation in "Nylon-n,m" refers to the number of carbon atoms in each monomer, with one being a diamine and the other a dicarboxylic acid.

Answer 1

The Correct Option is A

Step 1: What is Nylon-6,6.
Nylon-6,6 is a polymer made by joining two monomers in a condensation reaction. The two numbers tell us the carbon count in each monomer.
Step 2: Read the numbers.
The first 6 means a diamine with 6 carbons. The second 6 means a dicarboxylic acid with 6 carbons.
Step 3: Name the diamine.
The 6 carbon diamine is hexamethylenediamine, which has two $\text{NH}_2$ groups.
Step 4: Name the acid.
The 6 carbon diacid is adipic acid, which has two $\text{COOH}$ groups.
Step 5: How they join.
The $\text{NH}_2$ groups react with the $\text{COOH}$ groups, losing water and forming amide links. This builds the long nylon chain.
Step 6: Rule out the others.
Caprolactam gives Nylon-6, not Nylon-6,6. Ethylene glycol with terephthalic acid gives a polyester. So the answer is adipic acid and hexamethylenediamine.\[ \boxed{\text{Adipic acid and hexamethylenediamine}} \]