Which of the following can not classified as an ionic compound based on basic bonding concepts?

A l C l_{3}

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C u C l_{3}

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P C l_{3}

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K C l

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Solution

The correct options are
A $A l C l_{3}$
B $P C l_{3}$
Solution:- (A) $A l {C l}_{3}$ and (C) $P {C l}_{3}$
The electronegativity difference between the constituent elements in $A l {C l}_{3}$ and $P {C l}_{3}$ is not large enough, making it a polar-covalent bond.
It is very unlikely that $C u {C l}_{3}$ exists. The only two possible oxidation states of copper are $+ 1$ and $+ 2$ .
Hence $A l {C l}_{3}$ and $P {C l}_{3}$ are covalent in nature.

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