Which of the following are Lewis acids ?
$\mathrm{AlCl}_{3}$ and $\mathrm{SiCl}_{4}$
$\mathrm{PH}_{3}$ and $\mathrm{SiCl}_{4}$
$\mathrm{BCl}_{3}$ and $\mathrm{AlCl}_{3}$
$\mathrm{PH}_{3}$ and $\mathrm{BCl}_{3}$
Correct Option: , 3
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