A) \[B{{F}_{3}}\]
B) \[BaC{{l}_{2}}\]
C) \[AlC{{l}_{3}}\]
D) \[SnC{{l}_{3}}\]
Correct Answer: B
Solution :
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.
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