| I. \[CsF\] |
| II. \[KF\] |
| III. \[NaF\] |
| IV. \[LiF\] |
A) \[IV>III>II>I\]
B) \[I>II>III>IV\]
C) \[IV>II>III>I\]
D) \[I>III>IV>II\]
Correct Answer: B
Solution :
[b] Ion-pairing influences the reactivity of \[N\overset{\centerdot \centerdot }{\mathop{\overset{\bigcirc -}{\mathop{u}}\,}}\,\] The counter ion plays an important role in ion-pairing. As the size of cation decreases ion-pairing with \[{{X}^{\bigcirc -}}\]increases and nucleophilicity of \[{{X}^{\bigcirc -}}\]decreases. So the order is: \[CsF>KF>NaF>LiF\].
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