Solution :
$${\left[ {Cu{I_4}} \right]^{2 - }}$$ does not exist because $${I^ - }$$ being a stronger reducing agent reduces $$C{u^{2 + }}$$ to $$C{u^ + }.$$
$$2Cu{I_2} \to 2CuI + {I_2}$$
Releted MCQ Question on Inorganic Chemistry >> D and F Block Elements
Releted Question 1
When same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide, the ratio of volume of hydrogen evolved is