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 of the following undergoes `SN` reaction easily ?

Options

A. Vinyl bromide
B. Bromobenzene
C. p-Nitro bromobenzene
D.

Answer

C

Explanation

(a) Vinyl halide does not undergo either `SN^1` or `SN^2` reaction.
(b) Aryl halide does not undergo `SN` reaction unless benzene ring is activated by `EWG` [e.g., `NO_2` group].
(d) Bridge-head halides are inert to both `SN^1` and `SN^2` reactions.