Nitrogen forms $NCl_3$ whereas phosphorus forms both $PCl_3$ and $PCl_5$. Why?

  • A
    $P$ has orbitals that can be used in bonding,but $N$ does not have $3d$ orbitals in its valence shell.
  • B
    The size of the $N$ atom is larger than the $P$ atom.
  • C
    Phosphorus is more reactive towards chlorine than $N$.
  • D
    None of these.

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