Which of the following statements are correct about Nylon-`6,6`?

Options

A. Nylon fibers have higher tensile strenght than terylene fibers.
B. Nylon fibers have lower tensile strenght than terylene fibers.
C. In nylon, there is strong ihntermolecular `H`-bonding, while in trylene there is weak dipole-dipole interaction
D. In nylon, there is weak ihntermolecular `H`-bonding, while in trylene there is strong dipole-dipole interaction

Answer

To determine which statements about Nylon-6,6 are correct, we will analyze the properties of Nylon-6,6 and compare them with Terylene (also known as polyester). Here’s a step-by-step solution:

### Step 1: Understand the Composition of Nylon-6,6
Nylon-6,6 is a synthetic polymer made from hexamethylenediamine and adipic acid. It has a repeating unit that contains both amide (NH-CO) linkages, which are responsible for its properties.

**Hint:** Remember that the presence of NH-CO bonds in Nylon-6,6 contributes to its strong intermolecular hydrogen bonding.

### Step 2: Analyze Mechanical Strength
Nylon-6,6 is known for its high mechanical strength and superior resistance to wear and organic chemicals. It has more than double the strength and stiffness compared to unreinforced nylon.

**Hint:** Consider how the structure of Nylon-6,6 contributes to its mechanical properties.

### Step 3: Compare with Terylene
Terylene, on the other hand, does not have the same type of hydrogen bonding as Nylon-6,6. Instead, it primarily exhibits weak dipole-dipole interactions due to its ester linkages.

**Hint:** Focus on the types of intermolecular forces present in both polymers to understand their differences.

### Step 4: Evaluate the Statements
Now, let's evaluate the given statements:

1. **Nylon fiber has higher tensile strength than Terylene fiber.**
- This statement is **incorrect**. While Nylon-6,6 is strong, Terylene fibers are also known for their strength, and the comparison can vary based on specific conditions.

2. **In Nylon, there is strong intermolecular H bonding while in Terylene there is weak dipole-dipole interaction.**
- This statement is **correct**. Nylon-6,6 has strong hydrogen bonding due to its amide groups, while Terylene has weaker interactions.

3. **In Nylon, there is weak intermolecular H bonding while in Terylene there is strong dipole-dipole interaction.**
- This statement is **incorrect**. Nylon-6,6 has strong hydrogen bonding, contradicting this statement.

### Conclusion
Based on the analysis:
- The correct statement is: **In Nylon, there is strong intermolecular H bonding while in Terylene there is weak dipole-dipole interaction.**

### Summary of Correct Statements
- Only the second statement is correct.