Which of the following are lewis acids:

P H_{3}

and

B C l_{3}

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A l C l_{3}

and

S i C l_{4}

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B C l_{3}

and

A l C l_{3}

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P H_{3}

and

S i C l_{4}

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Solution

The correct option is C $B C l_{3}$ and $A l C l_{3}$
Both $B C l_{3}$ and $A l C l_{3}$ have vacant p-orbitals, so they can accept electrons and thus, can act as a lewis acids.
Simillarly, $S i C l_{4}$ also has vacant 3d orbitals, thus it can also act as a lewis acid.
$P H_{3}$ on the other hand, is a lewis base.

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