Which of the following is least stable?

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(D) The stability of tetrahalides of group $14$ elements decreases down the group due to the increasing size of the central metal atom and the inert p

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$PbI_4$

Vedclass · Answer

(D) The stability of tetrahalides of group $14$ elements decreases down the group due to the increasing size of the central metal atom and the inert pair effect.Specifically,$Pb^{4+}$ is a strong oxidizing agent because the $+2$ oxidation state is more stable than the $+4$ oxidation state for lead due to the inert pair effect.Therefore,$PbI_4$ is highly unstable and tends to decompose into $PbI_2$ and $I_2$ according to the reaction: $Pb^{4+} + 2I^{-} \rightarrow Pb^{2+} + I_2$.Thus,$PbI_4$ is the least stable among the given options.

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