Question
Give the second postulate of VSEPR theory. Predict at the structure of the molecule sulfur tetrafluoride with the help of VSEPR theory. Draw the structure.
Answer :
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The second postulate of the Valence Shell Electron Pair Repulsion (VSEPR) theory states that both bonding electron pairs and lone pairs of electrons present in the valence shell of the central atom repel one another and arrange themselves in such a way that the repulsion between them becomes minimum. The extent of repulsion is not the same for all electron pairs. Lone pairs occupy more space around the central atom because they are localized on one atom, while bonding pairs are shared between two atoms. Therefore, the order of repulsion is: Lone pair–Lone pair > Lone pair–Bond pair > Bond pair–Bond pair As a result of these repulsions, lone pairs exert a stronger influence on molecular geometry than bonding pairs, causing distortions from ideal bond angles. The structure of sulfur tetrafluoride (SF₄) can be predicted using the VSEPR theory by
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