Question

What are the types of hybridisation of iodine in interhalogen compounds $I{F}_3,I{F}_5$ and $I{F}_7$, respectively?

Answer 1

The central iodine atom in $I{F}_3$ has 3 bond pairs and 2 lone pairs of electrons. It undergoes $s{p}^{3}d$ hybridisation which results in trigonal bipyramidal (T-shaped) geometry.
The central iodine atom in $I{F}_5$ has 5 bond pairs and 1 lone pair of electrons. It undergoes $s{p}^3{d}^2$ hybridisation which results in octahedral (square pyramidal) geometry.
The central iodine atom in $I{F}_7$ has 7 bond pairs and 0 lone pairs of electrons. It undergoes $s{p}^3{d}^3$ hybridisation which results in pentagonal bipyramidal geometry.