Question

why is CCl4 not a Lewis

Answer 1

beyond four due to the presence of vacant d-orbitals in the valance shell. sicl4 and sncl4 are acts as a lewis acids because it has vacant d orbitals.but ccl4 has no vacant d orbitals.this is the reason for ccl4 not act as the lewis acid

Answer 2

ccl4 has no vacant d orbitals.this is the reason for ccl4 not act as the lewis acid.