How are `XeF_(2)` and `XeF_(4)` prepared ? Give their structures.

Explanation

`XeF_(2)` is prepared by heating Xenon and Fluorine in a seated Nickel -tube in the ratio 1:2 at 673K for 8hrs.
`Xe+F_(2) underset(673 k)overset(Ni) rarr XeF_(2)`
Structure
Xe in the first excited state

Xe undergoes `sp^(3)d` hybridisation. The `sp^(3)d` orbitals assume trigonal bipyramidal geometry. Two fluorine atoms form `2pi` bonds with Xe.

The bond pairs occup axial positions.
`XeF_(6)`: Xe and `F_(2)` are mixed in the ratio 1:20 ratio at.573K and 70 bar pressure. Structure of `XeF_(6)`

`XeF_(6)` is distorted octahedral in Xe in the third excited state

Molecule assumes pentagonal bipyramidal structure. Due to presence of lone pair, molecule will be distorted octahedral.