Which one of the compound is not known? (1) NCl5​ (2) PCl5 (3) AsCl5 (4) NCl3

Answer: (2) NCl5

  • Nitrogen does not have d orbitals to expand its covalence beyond four.
  • Since phosphorus and arsenic have d-orbitals, they can accept electrons from five Cl atoms.
  • The d-orbitals are absent in N, so electrons can only be accommodated in the p-orbitals of 5 Cl atoms. As a result, NCl5 does not exist.

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