Question

Number of $\angle FIF$ angles equal to ${90}^o$ and less than ${90}^o$ in $I{F}_7$ is $x$ and $y$ respectively. The value of $x-y$ is

Answer 1

$I{F}_7$ will form a pentagonal bipyramidal shape with $s{p}^3{d}^3$ hybridization having five equitorial bonds and two axial bonds.

Here, we have 10 $F-I-F$ bonds at ${90}^o$ and 5 $F-I-F$ bonds at ${72}^o$.