The decreasing order of nucleophilicity for the following anions is
${CH}_{3} {CO}_{2}^{-}, {CH}_{3} O^{-}, C_{6} H_{5} O^{-}, {NO}_{3}^{-}$

Question

The decreasing order of nucleophilicity for the following anions is CH 3 CO 2 − , CH 3 O − , C 6 H 5 O − , NO 3 −

TestHub · Accepted Answer

Since the electron donating atom is same, the nucleophilicity parallels basicity.
A conjugate base of a strong acid is weak and vice-versa.
The order of acidity is
$C H_{3} O H < C_{6} H_{5} O H < C H_{3} C O O H < H N O_{3}$
Thus, the order of basicity and nucleophilicity is
$C H_{3} O^{-} > C_{6} H_{5} O^{-} > C H_{3} C O_{2}^{-} > N O_{3}^{-}$

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