Give the reactivity in the decreasing order of the following nucleophiles towards nucleophilic addition reaction with compound A F3C−≡-CF3. (I) CH3O-          (II) C2H5O-  (III) CH3COO⊖    (IV) CH3SO3⊖

In the same nucleophilic centre, nucleophlilicity is parallel to basic character. Stronger the acid, weaker is the conjugated base.Acidic character order: CH3SO3H>CH3COOH>CH3OH>C2H5OHBasic and nucleophilicity order:CH3SO3-