Which of the following is not Lewis acid?

B F_{3}

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A l C l_{3}

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F e C l_{3}

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P H_{3}

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Solution

The correct option is D $P H_{3}$
$P H_{3}$ act as lewis base due to presence of lone pair
$B F_{3}, A l C l_{2}, F e C l_{3} \to$ are lewis base due to presence of vacant orbital.

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