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Question:

The increasing order of nucleophilicity of the following nucleophiles is:(a)CH3CO2⁻(b)H2O(c)CH3SO3⁻(d)OH⁻

(d)<(a)<(c)<(b)

(b)<(c)<(d)<(a)

(b)<(c)<(a)<(d)

(a)<(d)<(c)<(b)

Solution:

Correct option is A (b)<(c)<(a)<(d)
Lone pair donating tendency on oxygen is reduced, nucleophilicity reduced
b<c<a<d.