Which of the following compounds possesses Lewis acid character?

A l F_{3}

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S i F_{4}

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P F_{5}

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B F_{3}

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Solution

The correct options are
B $S i F_{4}$
C $P F_{5}$
D $B F_{3}$
$A l F_{3}$ is ionic in nature. It has completed its octet. Hence, it cannot act as lewis acid.
$B F_{3}$ has incomplete octet. So, it can accept an electron pair and act as lewis acid.
$S i F_{4}$ and $P F_{5}$ contain empty d orbitals. Hence, they can accept an electron pair and can act as lewis acids.

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