The leaving group is that functional group which is ejected with `overline e^, s` of the `sigma` -bond in a reaction. Better the leaving group, faster is the reaction. The relative leaving ability of the leaving group `X` in `(R - X)` is increased by :
(i) The polarisability of `(R - X)` bond.
(ii) The stability of `X^(Ө)`.
(iii) The degree of stabilisation through solvation of `X`.
(iv) The strength of `(R - X)` bond.
The leaving group tendency is also called fugacity.
Which one of the followingd has the highest fugacity ?

Options

A. Tosylate `(overset (Ө) O Ts)`
B. Mesylate
C. Triflate `(F_3 C - SO_3^(Ө))`
D. All are equal

Answer

C

Explanation

It is the conjugate base (weak base) of the strongest acid `(F_3 C - SO_3 H)`.