The number of lone pairs of electrons on SF4, CF4 and XeF4 are:
2,0 and 1 lone pairs of electrons respectively
1,1 and 1 lone pairs of electrons respectively
0,1 and 2 lone pairs of electrons respectively
1,0 and 2 lone pairs of electrons respectively
SF4 molecule has 1 lone pair of electrons, CF4 has no lone pair of electrons and XeF4 has 2 lone pair of electrons respectively.
The molecular shapes of SF4,CF4andXeF4 are