Chemically, “Neoprene” rubber is the polymer known as which of the following (identify its correct IUPAC-style common name)?

Introduction / Context:
Different elastomers often serve overlapping applications, but their chemistries yield distinct performance profiles. Accurately identifying Neoprene’s chemical name is important for specifying properties like oil resistance, flame behavior, and weathering stability in seals and belts.

Given Data / Assumptions:

• Neoprene is an elastomeric material.
• Monomeric unit involves chlorinated diene.
• Applications require balanced oil, ozone, and weathering resistance.

Concept / Approach:

Neoprene is polychloroprene (CR), polymerized from chloroprene (2-chloro-1,3-butadiene). The chlorine substituent contributes to flame retardancy and ozone resistance compared to unsaturated hydrocarbon rubbers like polybutadiene or SBR. Polyurethane elastomers are chemically distinct, formed by isocyanate–polyol reactions.

Step-by-Step Solution:

Verification / Alternative check:

Rubber industry resources list Neoprene = CR with grades tailored by crystallization rate and crystallite content for mechanical performance.

Why Other Options Are Wrong:

Polybutadiene/SBR: No chlorine; different oil/ozone behavior. Polyurethane: Not a polydiene; different curing and properties.

Common Pitfalls:

Assuming appearance or hardness alone identifies elastomers; overlooking halogenated backbone effects.

Final Answer:

Polychloroprene