Which of the following is most covalent ?

C u C l

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N a C l

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A g C l

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A u C l

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Solution

The correct option is C $A u C l$
Among the given halides, $A u C l$ is most covalent. This is because $A u^{+}$ ion has psuedo noble gas configuration ( $18$ electrons in the outermost shell). Hence, it has highest polarization power and is most covalent.

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