Consider the following groups :
The correct order of leaving group ability is
(a) I > II > III > IV
(b) IV > III > I > II
(c) III > II > I > IV
(d) II > III > IV > I
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The correct order of leaving group ability is : (b) IV > III > I > II
Leaving group ability depends upon basicity of group. The weaker the base, the greater is its leaving group ability. Alternatively, the stronger is conjugate acid, the greater the leaving group ability of the base.
The strength of conjugate acid is
HOSO2CF3 > HOSO2Me > HOAc > HOMe.