JEE Main On 08 April 2018 Question 27
Question: Which of the following are Lewis acids? [JEE Main Online 08-04-2018]
Options:
A) $ P{H _{\text{3 }}}\text{and SiC}{l_4} $
B) $ BC{l_3} $ and $ AlC{l_3} $
C) $ P{H_3} $ and $ BC{l_3} $
D) $ AlC{l_3} $ and $ SiC{l_4} $
Show Answer
Answer:
Correct Answer: B , D
Solution:
(b) and (d) $ BC{l_3} $ and $ AlC{l_3} $ both are hypovalent compounds due to incomplete octet on central atom.
Thus both can act as Lewis acid.
$ SiC{l_4} $ can also act as Lewis acid due to presence of vacant 3d-orbitals on silicon atom in its vacant d-orbital.
Option (a) and (c) both are correct.
