Question

The compound that is not a lewis acid is

• A. ${\mathrm{BCl}}_3$
• B. ${\mathrm{BaCl}}_2$
• C. ${\mathrm{AlCl}}_3$
• D. ${\mathrm{SnCl}}_4$

Answer 1

The correct option is B

${\mathrm{BaCl}}_2$

The explanation for the correct option

Option (B)${\mathrm{BaCl}}_{2_{}}$ — Barium chloride.

• Lewis acid is a species that contains an empty orbital.
• Capable of accepting an electron pair from a base known as lewis base.
• Results in Lewis adduct.

The explanation for the incorrect option

Option (A) ${\mathrm{BCl}}_3$ .

• As boron chloride is a lewis acid.
• Thus this option is incorrect.

Option (C) ${\mathrm{AlCl}}_3$

• As aluminium chloride accepts electron pairs it is a lewis acid.
• Thus this option is incorrect.

Option (D) ${\mathrm{SnCl}}_4$

• As stannous chloride is lewis acid.
• Thus this option is incorrect.

Hence Barium Chloride (${\mathrm{BaCl}}_2$) is not a lewis acid, option (B) is the correct answer.