Single Choice

The order of leaving group ability is : i. $$-OAc$$ ii. $$-OMe$$ iii. $$-OSO_4Me$$ iv. $$-OSO_2CF_3$$

A$$(i) > (ii) > (iii) > (iv)$$
B$$(iv) > (iii) > (i) > (ii)$$
Correct Answer
C$$(iii) > (ii) > (i) > (iv)$$
D$$(ii) > (iii) > (iv) > (i)$$

Solution

Weaker the base, better is the leaving group
The decreasing order of acidity is $$F_3C - SO_3H > MeSO_3H > AcOH > MeOH$$
The increasing order of basicity is $$F_3C^{\circleddash} < MeSO_3^{\circleddash} < AcO^{\circleddash} < MeO^{\circleddash}$$
$$(iv)$$ $$(iii)$$ $$(i)$$ $$(ii)$$
The decreaing order of leaving group ability is $$(iv) > (iii) > (i) > (ii)$$

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