$\text{ (A) }{\mathrm{BrF}}_5$ contains 10 electrons in place of eight.

$\text{ (B) }{\mathrm{SF}}_6$ contains 12 electrons in place of eight.

$\text{ (C) }{\mathrm{IF}}_7$ contains 14 electrons in place of eight.
So, octet rule is not applicable in these three molecules.