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Anomalous Behaviour of Fluorine

In SF4 molecu...

Question

In SF4 molecule,the lone pair of electrons occupies the equatorial position in preference to an axial position in the overall trigonal bipyramidal geometry

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Solution

This arrangement is to avoid the lone pair - bond pair repulsion. If the lone pair occupies the axial position, then there will be three 90 degree lone pair - bond pair repulsion and if it lies in the equatorial position there are only 2 such repulsions which prevents distortion of the molecule.

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