Question:
Which of these doesn’t exist?
Which of these doesn’t exist?
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Expanded octet in phosphorus is stable only with highly electronegative atoms (like F).
Updated On: Mar 19, 2026
- PH₃
- PH₅
- LuH₃
- PF₅
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The Correct Option is B
Solution and Explanation
Step 1: Phosphorus can expand its octet only with highly electronegative atoms like fluorine.
Step 2:
\beginitemize
• PH₃ exists (stable hydride)
• PF₅ exists (expanded octet with F)
• LuH₃ exists (lanthanide hydride)
• PH₅ does not exist (P cannot form stable pentahydride)
\enditemize
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