Give the reactivity in the decreasing order of the following nucleophiles towards nucleophilic addition reaction with compound `A(F_3C--=-CF_3)`.
(I) `CH_3O^(Θ)` (II) `C_3H_5^(Θ)`
(III) `CH_3COO` (IV) `CH_3SO_3^(Θ)`

Options

A. (a) `(II)gt(I)gt(III)gt(IV)`
B. (b) `(IV)gt(III)gt(I)gt(II)`
C. (c) `(I)gt(II)gt(IV)gt(III)`
D. (d) `(III)gt(IV)gt(II)gt(I)`

Answer

A

Explanation

In the same nucleophilic centre, nuleophilicity is parallel to basic character. Stronger the acid, weaker is the conjugated base.
Acidic character order: `CH_(3)SO_(3)H gt CH_(3) COOH gt CH_(3)OH gt C_(2)H_(5)OH`
Basic and nucleophilicity order:
`underset((IV))(CH_(3)Soverset(Theta)(O_(3)))lt underset((III))(CH_(3)COoverset(Theta)O) lt underset((I))(CH_(3)overset(Theta)O)lt underset((II))(C_(2)H_(5)overset(Theta)O)`