Discussion
Assertion (A): Low density polyethylene is made at very high pressure while the high density grade is not.
Reason (R): The free radical process that produces the branching requires those conditions.
Answer: C
Both are true and the reason gives the connection: Ziegler Natta and metallocene catalysts make linear chains at modest pressure, which is why the two grades come from quite different plants. Pressures above a thousand bar are used in the older route.
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