p-Block elementsHard

Question

Select the incorrect order.

Options

A.He > Ar > Kr > Ne > Xe - (abundance in air).   
B.He < Ne < Ar < Kr  < Xe - (boiling point).
C.XeF6 > XeF4 > XeF2 - (melting point).
D.XeF6 < XeF4 < XeF2- (Xe - F bond length).

Solution

(A) Ar > Ne > Kr > He > Xe   
(C) XeF2 > XeF4 > XeF6 (on the basis of packing of molecules in the lattice).

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