Which of the following are Lewis acids ?

Question:

Which of the following are Lewis acids ?

  1. $\mathrm{AlCl}_{3}$ and $\mathrm{SiCl}_{4}$

  2. $\mathrm{PH}_{3}$ and $\mathrm{SiCl}_{4}$

  3. $\mathrm{BCl}_{3}$ and $\mathrm{AlCl}_{3}$

  4. $\mathrm{PH}_{3}$ and $\mathrm{BCl}_{3}$


Correct Option:

Solution:

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