The compound that is not Lewis acid is:

B F_{3}

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A l C l_{3}

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S n C l_{4}

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H_{2} O

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Solution

The correct option is D $H_{2} O$
$B F_{3}$ , $A l C l_{3}$ and $S n C l_{4}$ are electron deficient species and have vacant orbital in which they can accomodate electron pair so they are Lewis acid.

$H_{2} O$ has 2 lone pair of electrons on oxygen so it can donate that pair so it is Lewis base.

Option D is correct.

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