First slide

Ionic equilibrium

Question

Which of the following species do not behave as Lewis acid?

Moderate

A

PCl₅
B

SF₄
C

XeF₂
D

IF₇

Solution

${PCl}_{5} behave as L.A$
${SF}_{4} behave as L.A$
${XeF}_{2} not behave as L.A$
$\underset{\begin{array}{l} Stable \end{array}}{{XeF}_{2} + {XF}^{- 1}} ⟶ \underset{Unstable}{{XeF}_{3}^{-}}$ $∴ Can not exist$
${IF}_{7} behave as L.A$

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