Polymer classification — identifying a copolymer Which of the following materials is formed from more than one monomer species and is therefore categorized as a copolymer (condensation network)?

Introduction / Context:
Polymers can be homopolymers (single monomer) or copolymers (two or more different monomers). Some well-known materials are textbook examples of each category. Recognizing these helps predict properties and processing behavior.

Given Data / Assumptions:

• PVC (polyvinyl chloride), polythene (polyethylene), and Teflon (PTFE) are common homopolymers.
• Bakelite is manufactured by condensation of phenol and formaldehyde.

Concept / Approach:
Homopolymers: PVC (from vinyl chloride), PE (from ethylene), PTFE (from tetrafluoroethylene) each derive from one monomer type. Bakelite is a thermosetting network formed by reacting two different monomers, making it a classic copolymer via condensation.

Step-by-Step Solution:
List the monomer(s) for each polymer.Identify whether single or multiple monomers are involved.Select Bakelite as the condensation copolymer (phenol + formaldehyde).

Verification / Alternative check:
Textbook classifications place Bakelite among phenol-formaldehyde resins, a two-component system forming a crosslinked network.

Why Other Options Are Wrong:

• PVC, polythene, Teflon: homopolymers; one monomer each.

Common Pitfalls:

• Assuming “network” implies single-monomer polymerization; here two monomers form the network.

Final Answer:
Bakelite