Question

Lewis acid character is maximum for ________.

• A. $SeC{l}_4$
• B. $SC{l}_4$
• C. $TeC{l}_4$
• D. $TeB{r}_4$

Answer 1

The correct option is C $TeC{l}_4$

Lewis acid character is due to lack of electrons and capability of compound to make more bonds.
Lewis acid character increases from top to bottom for a given halide in the group. Again acid character increases with increase of electronegativity of halogen(because as electro-negativity increases, compound become more electron deficient and it become more acidic). So $TeC{l}_4$ is a better Lewis acid than $TeB{r}_4,SC{l}_{4}andSeC{l}_4$.