Chemistry - CHEMICAL BONDING Question with Solution | TestHub
The shapes of molecules containing LP and BP are generally influences by LP as they show more repulsion on BP. In molecules having steric number 7 or more the LP may or may not influence the structure of molecule. The LP that influence the shape of molecule is known as stereo active LP and that do not influence, the shape is called stereo inactive. In some cases the LP is neither completely stereo active nor completely stereo inactive.
Generally molecules with steric number 6 or more than 6 are formed only by larger atoms of the periods 5 and beyond and in particular Te, I and Xe. When the surrounding atoms are smaller, the LP get some space in regular electron domain geometry and distort the shape of molecule. But if the surrounding atoms are larger, there will be no space for LP and it will occupy inner core thus becomes stereo inactive LP. (Chemical bonding and molecular geometry by Ronald J.Gillespie and Paul L.A Popelier P.251)
Regarding the false statement is
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have steric number 7 with 5BP and two LP. The two LP occupy the axial positions as fluorine atoms are small in size. If larger atoms or group come in to pentagonal planar structure due to steric hindrance the axial positions are also repelled more by the LP and axial position become longer and become unstable due to distortion.