(D) In $PR_3$,the phosphorus atom has vacant $d$-orbitals that can participate in synergic bonding.Specifically,the vacant non-axial $d$-orbitals of t

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(D) In $PR_3$,the phosphorus atom has vacant $d$-orbitals that can participate in synergic bonding.Specifically,the vacant non-axial $d$-orbitals of the phosphorus atom accept electron density from the filled metal $d$-orbitals,facilitating $M \xrightarrow{\pi} PR_3$ back-bonding in its complexes.