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  4. The decreasing order of nucleophilicity among the nucleophiles: (A)CH3 underset undersetO||C-O- (B)CH3O- (C) CN- <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/chemistry/b5a611f8bd3bba1408c2bf183c60a60b-.png />

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Q. The decreasing order of nucleophilicity among the nucleophiles :
(A)$CH_{3}\underset{\underset{O}{||}}{C}-O^-$
(B)$CH_3O^-$
(C) $CN^-$
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AIEEEAIEEE 2005Organic Chemistry – Some Basic Principles and Techniques

Solution:

If acid is weak, its conjugate base (nucleophile) is strong and vice versa.
Acidic nature of IV > I > III > II and nucleophilicity of B > C > A > D

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