This hypothesis states that, if in an acid catalyzed reaction, lg k1 (first-order rate constant of the reaction) is linear in Ho (Hammett acidity function), water is not involved in the transition state of the rate-controlling step. However, if lg k1 is linear in lg[H+], then water is involved. This has been shown to be incorrect by Hammett himself (see HAMMETT (1970)). LONG and PAUL (1957).
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