shape of the molecule [IF6]- ionis destoid octahedral according to NCERT XII without reason,why it is not pentagonal pyramidal shape,while angle 72* is less then 90*?

Dear Umesh Jakhar,

The Central Atom is Iodine(I) & it is surrounded by 6 fluoride ions !
It also has a lone pair !

It goes as this IF₆^- = 6 bond pairs + 1 lone pair !

Remember that for Pentagonal Bipyramidal you must have 7 Bond Pairs & no lone pair !!

So this assumes the shape of a distored octahedron & not a pentagonal bipyramidal shape !!

Hope you understood !!

All the Best & Good Luck !!
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I mean pentagonal mono pyramidal not bipyramidal .plz try to understand my problem.which have 6 bond pair and 1 lone pair same as tetraheadral,and less repultion.please explain.