Which of the following pentahalides is not po | vedclass

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Question

(D) The stability of the $+5$ oxidation state decreases down the group due to the inert pair effect. Nitrogen cannot form $NF_5$ because it lacks $d$-

Vedclass · Accepted Answer

$BiF_5$

Vedclass · Answer

(D) The stability of the $+5$ oxidation state decreases down the group due to the inert pair effect. Nitrogen cannot form $NF_5$ because it lacks $d$-orbitals. However,among the given options,$BiF_5$ is the least stable pentahalide. While $BiF_5$ does exist,it is a very strong fluorinating agent and is highly unstable compared to the others. In many contexts,$NF_5$ is considered impossible,but since it is not in the options,we look for the most unstable one. Actually,all $PF_5, AsF_5, SbF_5, BiF_5$ exist. If the question implies which one is not possible due to electronic configuration,$NF_5$ is the answer. Given the options provided,there might be a conceptual error in the question as all listed pentahalides are known. However,if we must choose,$BiF_5$ is often cited for its extreme reactivity and instability due to the inert pair effect making the $+5$ state difficult to maintain.

Which of the following pentahalides is not possible?

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