Question
Which of the following species do not exist?

Answer

$PbF_{4​}$ exists but $PbI_{4​}$ does not exist as $I_{2​ }$ reduces $Pb(II)$ to $Pb$ and oxidizes $I$ to $I_2​.$ Since, $I_2$​ is not strong reducing agent to reduce $Pb(II)$ to $Pb.$

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