For most electrophilic aromatic substitution reactions (like nitration), the primary kinetic isotope effect () is approximately 1. This observation proves that:

Question

For most electrophilic aromatic substitution reactions (like nitration), the primary kinetic isotope effect ($k_H/k_D$) is approximately 1. This observation proves that:

Prashant Kotian · Accepted Answer

Correct answer: D. Since replacing hydrogen with deuterium (which has a stronger bond) does not slow down the overall reaction rate, the bond must be breaking in a fast step that does not bottleneck the reaction.

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