Consider the reaction shown below, and select every statement that is true. PF 4
ID: 525271 • Letter: C
Question
Consider the reaction shown below, and select every statement that is true.
PF4+1 + F-1 --> PF5
This is not an example of a Lewis acid-base reaction because there are no protons involved in the reaction.
In this reaction, the phosphorus contributed one electron, and the fluoride ion contributed a second electron, resulting in a covalent bond forming between the phosphorus and the fluorine atom.
A mechanism for this reaction would include a curved arrow being drawn from one of the lone pairs on the fluoride, pointing toward the phosphorus.
Before the reaction, the phosphorus lacks an octet of electrons, and after the reaction, it has eight electrons.
This is not an example of a Lewis acid-base reaction because there are no protons involved in the reaction.
In this reaction, the phosphorus contributed one electron, and the fluoride ion contributed a second electron, resulting in a covalent bond forming between the phosphorus and the fluorine atom.
A mechanism for this reaction would include a curved arrow being drawn from one of the lone pairs on the fluoride, pointing toward the phosphorus.
Before the reaction, the phosphorus lacks an octet of electrons, and after the reaction, it has eight electrons.
Explanation / Answer
P+ (Z= 15) E.S.E.C. is 1s2 2s2 2p6/ 3s1 3p3
The four orbitals having valence electron of P+ ions overlap with p-orbital of F having unpaired electrons to PF4+ ion. Now, P has no unpaired electrons.
SO, the vacant orbital of P+ ion overlap with paired p-orbital of F- ion to form PF5 molecule.
PF4+ + F- ----------> PF5
The correct statement is,
A mechanism for this reaction would include a curved arrow being drawn from one of the lone pairs on the fluoride, pointing toward the phosphorus
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