• # question_answer Which of the following halides is least stable and has doubtful existence [IIT 1996] A) $C{{I}_{4}}$ B) $Ge{{I}_{4}}$ C) $Sn{{I}_{4}}$ D) $Pb{{I}_{4}}$

Solution :

$Pb{{I}_{4}}$ is least stable because of two reasons (1) Size of iodine is biggest. (2) $+2$ oxidation state of Pb is more stable than $+4$ state because of inert pair effect.

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