Which of the following is a Lewis acid?

P C l_{3}

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A l C l_{3}

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N C l_{3}

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A s C l_{3}

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Solution

The correct option is C $A l C l_{3}$
Lewis acid is the electron pair acceptor.
In $A l C l_{3}$ the central atom Al has vacant d orbitals so it can accept pair of electrons , so it is a Lewis acid. $P C l_{3}$ , $N C l_{3}$ and $A s C l_{3}$ are electron rich species hence they do not act as Lewis acid.

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