Consider the following transformation:
$2CuX_2 \xrightarrow{\text{Room temperature}} 2CuX + X_2 \uparrow$
Then $X^-$ can be:
$2CuX_2 \xrightarrow{\text{Room temperature}} 2CuX + X_2 \uparrow$
Then $X^-$ can be:
- A$F^-, Br^-$
- B$Cl^-, Br^-$
- C$CN^-, I^-$
- D$Cl^-, F^-$
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