Give the reactivity in the decreasing order of the following nucleophiles towards nucleophilic addition reaction with compound $A (F_{3} C - \equiv - C F_{3})$
(I) $C H_{3} O^{⊝}$
(II) $C_{3} H_{5}^{⊝}$
(III) $C H_{3} C O O^{⊝}$
(IV) $C H_{3} S O_{3}^{⊝}$

(II) > (I) > (III) > (IV)

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(IV) > (III) > (I) > (II)

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(I) > (II) > (IV) > (III)

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(III) > (IV) > (II) > (I)

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Solution

The correct option is A (II) > (I) > (III) > (IV)
In the same nucleophilic centre, nucleophilicity is parallel to basic character. Stronger the acid, weaker is the conjugated base
Acidic character order : $C H_{3} S O_{3} H > C H_{3} C O O H > C H_{3} O H > C_{2} H_{5} O H$
Basic and nucleophilicity order will be opposite of this.

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50^{\circ}

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