Question

Which of the following halides is least stable and has doubtful existence?

• A. $C{I}_4$
• B. $Sn{I}_4$
• C. $Ge{I}_4$
• D. $Pb{I}_4$

Answer 1

The correct option is D $Pb{I}_4$

As we go down the group the stability of halides will decrease due to increase in size of halogen atom,because of this reason the halogens easily disassociates from the compound,so lead iodide is least stable among the halides of 14th group elements.

Non existance of $Pb{I}_4$ can be explained on the basis of strong oxidising nature of Pb4+ .

$P{b}^{4+}$ + $2I^{-}$ $\to$ $P{b}^{2+}$ + $I_2$

Hence option D is correct.