Question

The compound that is not a Lewis acid, is

• A. $B{{F}_{3}}$
• B. $BaC{{l}_{2}}$
• C. $AlC{{l}_{3}}$
• D. $SnC{{l}_{3}}$

Answer 1

Answer: (B)

$BaC{{l}_{2}}$

Answer 2

Lewis acid are those compound, which can take up an electron-pair (i.e., they have incomplete octet), e.g., $BC{{l}_{3}},$ $AlC{{l}_{3}},$ $SnC{{l}_{4}},$ $S{{O}_{3}},$ $A{{l}^{3+}}$ etc. $BaC{{l}_{2}}$ is an ionic-compound which is not deficient in electrons, hence cannot accept electron pair. Hence, it is not a Lewis acid.