A) \[PC{{l}_{3}}\]
B) \[SbC{{l}_{3}}\]
C) \[BiC{{l}_{3}}\]
D) \[CC{{l}_{4}}\]
Correct Answer: A
Solution :
[a] \[PC{{l}_{3}}\] In \[CC{{l}_{4}},\] carbon atom does not have empty d-orbitals to accommodate a lone pair of electrons and hence is not a lewis acid. In \[PC{{l}_{3}}\],\[SbC{{l}_{3}}\]and \[BiC{{l}_{3}}\]central atom has empty d-orbitals in each case but electronegativity of P is maximum hence \[PC{{l}_{3}}\] is strongest lewis acid.
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