Discussion
Assertion (A): Condensation polymerisation requires very accurate stoichiometry between the two monomers.
Reason (R): An excess of one monomer caps the growing chains and limits the molecular weight.
Answer: C
Both are true and the reason gives the mechanism: with a step growth reaction the molecular weight rises only in the last few per cent of conversion, and any imbalance stops it short. A monofunctional impurity has the same effect.
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