Discussion
Assertion (A): Semi-batch addition of one reactant is a way of controlling selectivity as well as heat release.
Reason (R): It holds the concentration of the added reactant low throughout the reaction.
Answer: B
Both are true and the reason gives the shared mechanism, and it is common for the same feed policy to be justified on both grounds at once: the slow addition limits how fast heat can be released and at the same time keeps the reactant concentration where selectivity is best.
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