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Question:

Decreasing order of nucleophilicity is: OH⁻>NH₂>CH₃O⁻>RNH₂

OH⁻>NH₂>CH₃O⁻>RNH₂

NH₂>OH⁻>CH₃O⁻>RNH₂

NH₂>CH₃O⁻>OH⁻>RNH₂

CH₃O⁻>NH₂>OH⁻>RNH₂

Solution:

If the nucleophilic atoms are in the same row of periodic table, nucleophilicity is approximately in order of basicity. So, the order is NH₂>CH₃O⁻>OH⁻>RNH₂.