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

Options

A. `C Cl_4`
B. `Gel_4`
C. `SnI_4`
D. `Pbl_4`

Answer

D

Explanation

Due to strong inert pair effect , `Pb^(2+)` is more stable tha `Pb^(4+)` . Non-existence of ` Pb_4` can be explained on the basis of strong oxdising nature of ` Pb^(4+)` . The iodide ions are preducing angents . In the presence of these ions , ` Pb^(4+)` ions are reduced to `Pb^(2+)` ions .
`Pb^(4+) + 2 I^(Θ) rarr Pb^(2+) +I_2`.