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.