MCQ
$PC{l_5}$ exists but $NC{l_5}$ does not because
  • Nitrogen has no vacant $d-$ orbitals
  • B
    $NC{l_5}$ is unstable
  • C
    Nitrogen atom is much smaller
  • D
    Nitrogen is highly inert

Answer

Correct option: A.
Nitrogen has no vacant $d-$ orbitals
(a) Nitrogen does not have vacant $‘d’-$ orbitals so it can’t have $+5$ oxidation state

i.e. the reason $PC{l_5}$ exists but $NC{l_5}$ does not.

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