Neoprene production — The monomer used to produce neoprene rubber is:

Introduction / Context:
Linking elastomer trade names to their monomers clarifies structure–property relationships. Neoprene is prized for oil and weather resistance; this originates from the chlorine substituent on its diene monomer.

Given Data / Assumptions:

• We identify the specific monomer for neoprene.
• Common conjugated dienes and halo-derivatives are listed.

Concept / Approach:
Neoprene is polychloroprene formed by the polymerization of chloroprene (2-chloro-1,3-butadiene). The presence of chlorine provides enhanced oxidative and oil resistance relative to polyisoprene or polybutadiene elastomers.

Step-by-Step Solution:
Match name: neoprene ↔ polychloroprene.Thus, the monomer must be chloroprene.Therefore, choose chloroprene.

Verification / Alternative check:
Polymer references and manufacturer datasheets consistently define neoprene as polychloroprene made from chloroprene.

Why Other Options Are Wrong:

• Chloroethane, vinyl chloride: produce different polymers (e.g., PVC from vinyl chloride).
• Isoprene: yields natural rubber equivalent (polyisoprene).
• Butadiene: yields polybutadiene or SBR when copolymerized with styrene.

Common Pitfalls:
Confusing chloroprene with vinyl chloride or isoprene due to similar names; forgetting the necessity of the conjugated diene structure.

Final Answer:
Chloroprene (2-chloro-1,3-butadiene)