Condensation of bisphenol-A with phosgene yields which engineering thermoplastic noted for high heat resistance and impact strength?

Introduction / Context:
Knowing the monomer pairs helps identify the polymer family and its properties. Bisphenol-A and phosgene form carbonate linkages that define a widely used clear engineering plastic.

Given Data / Assumptions:

• Bisphenol-A (diol) and phosgene (carbonyl chloride) are the reactants.
• Interfacial or melt transesterification routes may be used.
• We compare to other polymer families.

Concept / Approach:
Bisphenol-A + phosgene → polycarbonate (PC), featuring carbonate linkages in the backbone. Polyurethanes arise from diisocyanate + polyol; polysulphones involve sulphone linkages; generic “polyesters” are from diols with diacids/diesters (not specifically BPA + phosgene).

Step-by-Step Solution:
Map BPA + phosgene → carbonate linkages → PC.Eliminate polyurethane, polysulphone, and unspecific polyester.

Verification / Alternative check:
Manufacturing routes for PC include interfacial phosgenation and phosgene-free transesterification (DPC route), both anchored to BPA.

Why Other Options Are Wrong:
Chemistries do not match the listed monomer pair.

Common Pitfalls:
Mixing up carbonate vs ester linkages due to similar names.

Final Answer:
Polycarbonate