Which of the following statements is not true?
A)All good leaving groups are weak bases with strong conjugate acids.
B)Left-to-right across a row of the periodic table,leaving group ability increases.
C)Down a column of the periodic table,leaving group ability increases.
D)Equilibrium favors the products of the nucleophilic substitution when the leaving group is a stronger base than the nucleophile.

Question

Quizplus · Accepted Answer

Leaving group ability is generally associated with the stability of the leaving group once it has left, which correlates with it being a weak base. A stronger base as a leaving group would be less stable and less likely to leave, making the statement in D incorrect. Equilibrium actually favors the formation of products when the leaving group is a weaker base than the nucleophile, as this typically means the leaving group is more stable (and thus a better leaving group) once it has departed from the substrate.

Which of the Following Statements Is Not True