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 is the wrong order of fugacity ?A. `SbH_3 gt AsH_3 gt PH_3 gt NH_3`B. `F^(Ө) gt overset (Ө) O H gt overset (Ө) N H_2 gt overset (Ө) C H_3`C. `NH_3 gt NH_2 - NH_2 gt MeNH-NH -Me gt Me_2 N-Nme_2`D. `C overset (Ө) N gt overset (Ө) OH gt MeO gt overset (Ө) CH_3`.

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 is the wrong order of fugacity ?A. `SbH_3 gt AsH_3 gt PH_3 gt NH_3`B. `F^(Ө) gt overset (Ө) O H gt overset (Ө) N H_2 gt overset (Ө) C H_3`C. `NH_3 gt NH_2 - NH_2 gt MeNH-NH -Me gt Me_2 N-Nme_2`D. `C overset (Ө) N gt overset (Ө) OH gt MeO gt overset (Ө) CH_3`.
Answer» Correct Answer - D Acidic order : `HCN gt MeOH gt H_2 O gt CH_4` Basic order : `overset (Ө) C H lt MeC^(Ө) lt overset (Ө) H lt overset (Ө) C H_3` Weaker the base, better is the leaving group. Fugacity order : `overset (Ө) C N gt MeO^(Ө) gt overset (Ө) O H gt overset (Ө) C H_3`.

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