First slide
Alkynes
Question

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

Difficult
Solution

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>C2H5OH
Basic and nucleophilicity order:
CH3SO3-<CH3COO<CH3O<C2H5O- (IV)                   (III)               (I)                (II)             

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