Which of the following are Lewis acids ?

Question

Which of the following are Lewis acids ? (A) PH3 and BCl3 (B) AlCl3 and SiCl4 (C) PH3 and SiCl4 (D) BCl3 and AlCl3

Tardigrade Admin · Accepted Answer

BCl 3- electron deficient, incomplete octet AlCl 3- electron deficient, incomplete octet Ans-(4) BCl 3 and AlCl 3 SiCl 4 can accept lone pair of electron in d -orbital of silicon hence it can act as Lewis acid. Although the most suitable answer is (4). However, both option (4) (2) can be considered as correct answers. e.g. hydrolysis of SiCl 4 <img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/chemistry/2f366a24fb3cc5110c2a5c1131ab0197-.png" />

Q. Which of the following are Lewis acids ?

$P H_{3}$ and $BC l_{3}$

$A lC l_{3}$ and $S i C l_{4}$

$P H_{3}$ and $S i C l_{4}$

$BC l_{3}$ and $A lC l_{3}$

Q. Which of the following are Lewis acids ?

PH3​ and BCl3​

AlCl3​ and SiCl4​

PH3​ and SiCl4​

BCl3​ and AlCl3​

$P H_{3}$ and $BC l_{3}$

$A lC l_{3}$ and $S i C l_{4}$

$P H_{3}$ and $S i C l_{4}$

$BC l_{3}$ and $A lC l_{3}$