A) \[C{{l}_{2}}O\]
B) \[NC{{l}_{3}}\]
C) \[{{\operatorname{PbCl}}_{2}}\]
D) \[BaC{{l}_{2}}\]
Correct Answer: D
Solution :
According to Fajan?s rule: \[\operatorname{Covalent} character \propto \,\,\frac{1}{size\,\,of\,\,cation}\] Among the given species order of size of cations \[{{\operatorname{N}}^{3+}}<{{O}^{2+}}<P{{b}^{2+}}<B{{a}^{2+}}\] Order of size of anions \[{{\operatorname{O}}^{2-}} > C{{l}^{-}}\]. Hence the order of covalent character is \[\operatorname{NC}{{l}_{3}}>C{{l}_{2}}O>PbC{{l}_{2}}>BaC{{l}_{2}}\] \[\therefore \,\,\,\,BaC{{l}_{2}}\] is most ionic in nature.
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