Question

Polymer X is an example of polyester and Y is an example of polyamide. X and Y are respectively

• A. Novolac, Terylene
• B. Dacron, Nylon 6,6
• C. Nylon 6, Terylene
• D. Teflon, Terylene

Hint:

Quickly classify polymers by their name and linkage: - \textbf{Poly\underline{ester}} (e.g., Dacron, Terylene): Contains ester (-COO-) links. - \textbf{Poly\underline{amide}} (e.g., Nylon): Contains amide (-CONH-) links. - Polymers with "fluoro" or "ethene" in the name (e.g., Teflon, Polythene) are usually addition polymers. - Resins like Bakelite and Novolac are phenol-formaldehyde condensation polymers.

Answer 1

The Correct Option is B

We need to identify a polyester (X) and a polyamide (Y) from the given options.
Polyesters are polymers that contain the ester functional group (-COO-) in their main chain. They are typically formed by the condensation polymerization of a dicarboxylic acid and a diol.
Polyamides are polymers that contain the amide functional group (-CONH-) in their main chain. They are formed by the condensation polymerization of a dicarboxylic acid and a diamine, or by the ring-opening polymerization of a lactam.
Let's analyze the polymers in the options:
- Dacron is another name for Terylene. It is a polyester made from ethylene glycol and terephthalic acid. So, Dacron/Terylene is a polyester (X).
- Nylon 6,6 is a polyamide made from hexamethylenediamine and adipic acid. The name "6,6" comes from the fact that both monomers have 6 carbon atoms. So, Nylon 6,6 is a polyamide (Y).
- Nylon 6 is a polyamide made from the ring-opening polymerization of caprolactam. It is a polyamide (Y).
- Novolac is a phenol-formaldehyde resin. It is not a polyester or a polyamide. It is a thermosetting polymer.
- Teflon (Polytetrafluoroethylene, PTFE) is an addition polymer made from tetrafluoroethene monomer. It does not have ester or amide linkages.
Now let's check the options:
(A) Novolac (not polyester), Terylene (polyester). Incorrect.
(B) Dacron (polyester), Nylon 6,6 (polyamide). This matches the requirement that X is a polyester and Y is a polyamide. This is correct.
(C) Nylon 6 (polyamide), Terylene (polyester). This is in the wrong order (Y, X). Incorrect.
(D) Teflon (not polyester), Terylene (polyester). Incorrect.