$C u^{2 +} (a q .) + X^{-} (a q .) R . T ⟶ C u X ↓ + X_{2}$
'X' cannot be:

C l^{-} (a q .)

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I^{-} (a q .)

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C N^{-} (a q .)

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S C N^{-} (a q .)

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Solution

The correct option is A $C l^{-} (a q .)$
$C u^{2 +}$ has an oxidizing property which turns $I^{-}, C N^{-}, S C N^{-}$ to $I_{2}, (C N)_{2}, (S C N)_{2}$ , but does not oxidize $C l^{-}$ as it is a weaker reductant.

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