The and mechanisms are frequently observed as strongly competing pathways during the solvolysis of bulky tertiary alkyl halides. Which of the following fundamental kinetic realities most accurately ex

Question

The $S_N1$ and $E1$ mechanisms are frequently observed as strongly competing pathways during the solvolysis of bulky tertiary alkyl halides. Which of the following fundamental kinetic realities most accurately explains why these two specific reaction pathways are inextricably linked and incredibly difficult to physically isolate from one another?

Prashant Kotian · Accepted Answer

Correct answer: B. In solvolysis conditions (highly polar protic solvent, weak base/nucleophile), tertiary alkyl halides slowly undergo ionization. This slow, rate-determining step forms a highly reactive carbocation intermediate and an expelled halide ion. Because both the substitution and elimination pathways branch directly off from this exact same reactive intermediate in their respective fast second steps (either nucleophilic attack or -proton abstraction), they invariably compete and almost always yield a mixture of both products.

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