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Which outcome occurs when a ruthenium catalyst temporarily violates Hund's rule?

A)Increased reaction rate selectively favoring products
B)Catalyst deactivation by surface oxidation
C)Decreased activation energy across all pathways
D)Randomized electron spin reversing magnetic polarity

💡 Explanation

Increased reaction rate follows from *spin catalysis*. Hund's rule violation creates transient open-shell configurations with radical character that lowers barrier to *specific* transition states because it promotes selective reactivity rather than global acceleration or spin randomization.

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