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 ?A. Vinyl bromideB. BromobenzeneC. p-Nitro bromobenzeneD.

The leaving group is that functional group which is ejected with `over

1.	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 ?A. Vinyl bromideB. BromobenzeneC. p-Nitro bromobenzeneD.
Answer» Correct Answer - C (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.

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