\(PCl_5\) is well known, but \(NCl_5\) is not. Because,
- nitrogen is less reactive than phosphorous
- nitrogen doesn’t have d-orbitals in its valence shell.
- catenation tendency is weaker in nitrogen than phosphorous.
- size of phosphorous is larger than nitrogen
The Correct Option is B
Solution and Explanation
\(PCl_5\) is well known but \(NCl_5\) is not because nitrogen does not have vacant d-orbitals in its valence shell.
So, nitrogen cannot expand its octet.
On the other hand phosphorus has vacant d-orbitals in its valence shell which enables it to expand its octet.
Therefore, the correct option is (B): nitrogen doesn’t have d-orbitals in its valence shell.
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