Give an account of VSEPR Theory and its applications.
Answers
Valence Shell Electron Pair Repulsion ( VSEPR ) theory was proposed by Sidgwick and Powell later it was developed by Nyholm and Gillespie
POSTULATES :-
1) the shape of the molecule depends upon number of electron pairs in valence shell of central atom
2) the shape of the molecule also depends upon repulsion between electron pairs
3) the bond angle of the molecule is depends upon repulsion between electron pairs and electronegativity difference between central atom and bonding atom
4) The Lone pair of electrons occupies more space around the central atom then Bond pair of electrons
5) the repulsions among electron page decreases in the order. l.p - l.p > l.p - b.p > b.p - b.p
6) repulsion among triple, double, single, bonds decrease in the order
triple bond > double bond > single bond
7) repulsion forces decreases shortly with increase in angle between electron pairs