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# 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: , 3

Solution: