The rate of `SN^2` reaction depends on the effectiveness of the nucleophile in ejecting the leaving group. Nucleophilicity is the affinity for `C` atom, while basicity is the affinity for proton.

In both cases, a new bond is formed. If a new bond is formed between the anion and proton, the specied acts as a base. If a new bond is formed between the anion and `C` atom, the species acts as nucleophile.
Which of the following statements is wrong ? Nucleophile order of the following in weakly polar aprotic solvents, e.g., acetone is :

Options

A. `LiI gt LiBr gt LiCl gt gt LiF`.
B. `CsF gt RbF gt KF gt NaF gt LiF`
C. `R_4 N^(oplus) I^(Ө) gt R_4 N^(oplus) Br^(Ө) gt R_4 N^(oplus) Cl^(Ө)` (R = Butyl group)
D. All

Answer

C