Which of the following are Lewis acides?

P H_{3}

and

S i C l_{4}

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B C l_{3}

and

A I C l_{3}

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P H_{3}

and

B C l_{3}

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None of these

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Solution

The correct option is D $B C l_{3}$ and $A I C l_{3}$
Boron trichloride is capable of accepting pair(s) of electrons from electron-rich species so it acts as Lewis acid.
$A l C l_{3}$ is probably the most commonly used Lewis acid and also one of the most powerful. It finds application in the chemical industry as a catalyst for Friedel-Crafts reactions, both acylations, and alkylations. Important products are detergents and ethylbenzene. It also finds use in polymerization and isomerization reactions of hydrocarbons.
conclusion: hence the option (B) is correct.

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