The correct order of n-acid nature is:

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${PF}_{3} > CO > {PCl}_{3} > {PPh}_{3}$

${PF}_{3} > CO > {PPh}_{3} > {PCl}_{3}$

${PF}_{3} > {PCl}_{3} > CO > {PPh}_{3}$

$CO > {PF}_{3} > {PCl}_{3} > {PPh}_{3}$

answer is A.

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Detailed Solution

The correct order of n-acid nature is $P F_{3} > C O > P C l_{3} > P P h_{3}$

Strong -acid trifluorophosphine (PF3) has bonding characteristics that are similar to those of the carbonyl ligand. Early research suggested that phosphine ligands used the phosphorus atom's 3d orbitals to produce M-P pi-bonding, however it is now widely acknowledged that this is not the case.

CO:

CO has good -acceptor (or acid) and -donor (or base) properties.

${PCl}_{3}$

The P-Cl covalent bonds are formed as a result of sp³ hybrid orbitals overlapping with 3p orbitals of chlorine.

${PPh}_{3}$

Because phosphines with electronegative substituents have lower energy $σ *$ orbitals, phosphorus trifluoride is a very effective -acceptor.

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