(c)
In $IF_{5}$, halogens are member of VII group.
Summation of group number
= 42
Bond pair = $\frac{42}{8} = 5(Residue\ )\ 2$
Lone pair = $\frac{2}{2}$=1
5 bond pair, 1 lone pair means the geometry is square pyramidal and $sp^{3}d^{2}$ hybridisation.