Which of the following are Lewis acids?

A l C l_{3} a n d S i C l_{4}

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P H_{3} a n d S i C l_{4}

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B C l_{3} a n d A l C l_{3}

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P H_{3} a n d B C l_{3}

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Solution

The correct option is C $B C l_{3} a n d A l C l_{3}$
Lewis acid is an electron acceptor. Both $B C l_{3} a n d A l C l_{3}$ have vacant p-orbital and thus incomplete octet. Hence, they will act as Lewis acid.

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