Question

All Cu(II) halides are known except iodide. The reason for this is that
A. iodide ion is a bulky ion
B. `Cu^(2+)` oxidizes iodide to iodine
C. `Cu^(2+) ` (aq) has much more negative hydration enthalpy
D. `Cu^(2+)` ion has smaller size

Answer 1

Iodide `(I^(-))` ions are stronger reducing agent. They reduce `Cu^(2+)` to `Cu^(+) ( 2CuI_(2) rarr Cu_(2)I_(2)+ I_(2))` In other words, `Cu^(2+)`oxidizes `I^(-)` ions to`I_(2)`
`(2Cu^(2+) + 4I^(-) rarrCu_(2)I_(2)(s)+ I_(2))`