Which of the following pentahalides is NOT fo | vedclass

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(D) Due to the inert pair effect,the stability of the $+5$ oxidation state decreases down the group $15$. $Bi$ (Bismuth) is the heaviest element in th

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$BiF_5$

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(D) Due to the inert pair effect,the stability of the $+5$ oxidation state decreases down the group $15$. $Bi$ (Bismuth) is the heaviest element in the group,and its $+3$ oxidation state is much more stable than its $+5$ oxidation state. Therefore,$Bi$ does not form a stable pentahalide like $BiF_5$ under normal conditions; instead,it prefers to form trihalides.

Which of the following pentahalides is $NOT$ formed?

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