Question

Which of the following exists ?

• A. $MnF_{7}$
• B. $K_{2}\left[CuI_{4}\right]$
• C. $MnO_{3}F$
• D. All of these

Answer 1

Answer: (C)

$Mn$ has tendency to form
Fluorine is highly electronegative. Therefore, fluorine atom has a strong tendency to attract electrons. seven fluorine does not create a crowd surrounding the manganese atoms. Hence $MnF_{7}$ is not stable.
As $\text{I}^{-}$ is a stronger reducing agent, i.e. reductant, and reduces $\text{Cu}^{2 +}$ into $Cul$ and Itself is oxidized into $I_{2}$ ​. Therefore, $\left[\right. CuI_{4} \left]\right.^{2 -}$ does not.
$MnO_{3}F$ in $Mn^{+ 7}$ and less crowded surrounding cental metal hence, it is stable.