Among the following species, the number that are planar (all atoms in one plane) and have at least two lone pairs of electrons on the central atom is…

Use VSEPR with the steric number. $\mathrm{XeF_4}$ (4 bp + 2 lp, octahedral parent) is square planar, with two lone pairs. $\mathrm{ClF_3}$ (3 bp + 2 lp, trigonal bipyramidal parent) is T-shaped, with both lone pairs equatorial, so the molecule is planar. $\mathrm{I_3^-}$ (2 bp + 3 lp) is linear, which is trivially planar with three lone pairs. $\mathrm{ICl_4^-}$ (4 bp + 2 lp) is square planar. $\mathrm{SF_4}$ (see-saw) has one lone pair and is non-planar. $\mathrm{BrF_5}$ and $\mathrm{XeOF_4}$ are square pyramidal with one lone pair, $\mathrm{XeO_3}$ is pyramidal with one lone pair, and $\mathrm{PCl_5}$ has none. The count is therefore 4.