Which of the following does not exists ?

For Pb "+2" oxidation state is more stable than +4 oxidation state, due to inert pair effect, hence Pb can't form tetrahalides like PbCl4, PbBr4 and PbI4 . But PbF4 can exist in natureReason: The electronegativity of fluorine is very high and hence it can activate the [Excites the] s-orbital electron pair by excitation of s-orbital electron pair it can form PbF4.PbF4 is ionic in nature →Br, I 's they can't excite the valency s-orbital electron pair and hence they can't form PbBr4 and PbI4→Pb+4 is oxidant and Br- , I- are reductant hence there is no scope of reaction between them Pb+4 and I- or Pb+4 and Br-