Discussion
Assertion (A): Bulk polymerisation is difficult to control at industrial scale.
Reason (R): The reaction is strongly exothermic and the viscosity rises sharply as it proceeds.
Answer: C
Both are true and the reason gives the difficulty: the rising viscosity impedes both mixing and heat transfer just as the heat release is greatest, which can lead to a runaway called the gel effect. Cooling capacity is what limits the batch size.
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