Which of the following compounds possesses Lewis acid character ?
I. $B F_{3}$
II. $S i F_{4}$
III. $P F_{5}$
Select the correct answer using the codes given below.

I alone

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I, II and III

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II and III

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I and III

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Solution

The correct option is D I, II and III
$B F_{3}$ has empty 2p orbital so it has a tendency to accept a lone pair and acting as lewis acid.
$S i F_{4}$ has empty 3d orbitals so it has a tendency to accept a lone pair and acting as lewis acid..
$P F_{5}$ has empty 3d orbital so it has a tendency to accept a lone pair and acting as lewis acid.

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