Answer :
In the mentioned pair, the species
[tex] {Cu}^{2+} [/tex] is stronger Lewis acid.
To determine the strength of Lewis acid, firstly we need to understand the definition of Lewis acid. Based on definition, Lewis acid is an electron pair acceptor.
Now, interpreting the information of given species of Copper. The one positive sign indicates deficiency of one electron and two positive signs indicates deficiency of two electrons. Based on this, the [tex] {Cu}^{2+} [/tex] will require two electrons and hence will be stronger Lewis acid.
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