The elimination reaction involves the initial fast reversible formation of a carbanion intermediate, followed by a slow rate-determining departure of the leaving group. Its energy profile diagram will

Question

The $E1cB$ elimination reaction involves the initial fast reversible formation of a carbanion intermediate, followed by a slow rate-determining departure of the leaving group. Its energy profile diagram will feature:

Prashant Kotian · Accepted Answer

Correct answer: B. The mechanism is a two-step process. Step 1 (deprotonation) is fast, indicating a lower activation barrier (first hump). Step 2 (loss of leaving group) is the slow, rate-determining step, which corresponds to the highest activation energy barrier (highest second hump).

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