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Valence shell electron pair repulsion theory, or VSEPR theory, is a model used in chemistry to predict the geometry of individual molecules from the number of electron pairs surrounding their central atoms. It is also named the Gillespie-Nyholm theory after its two main developers, Ronald Gillespie and Ronald Nyholm.
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(i) The order of the repulsion between different pair of electrons is lp−lp>lp−bp>bp−bp (ii) In general, as the number of lone pair of electrons on central atom increases, value of bond angle from normal bond angle also increases. (iii) The number of lone pair on O in H2O is 2 while on N in NH3 is 1.
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Correct option is
A
True
It is true because in lone pair the electrons are not involved in bonding and are free hence the repulsion is greater.
The lone pair -bond pair repulsion is slightly greater than bond pair -bond pair because of one free electron and hence the given order is correct.
Answer:
1)Valence Shell Electron Pair Repulsion Theory (VSEPR) is a molecular model to predict the geometry of the atoms making up a molecule where the electrostatic forces between a molecule's valence electrons are minimized around a central atom.
The theory is also known as Gillespie–Nyholm theory, after the two scientists who developed it). According to Gillespie, the Pauli Exclusion Principle is more important in determining molecular geometry than the effect of electrostatic repulsion.
According to VSEPR theory, the methane (CH4) molecule is a tetrahedron because the hydrogen bonds repel each other and evenly distribute themselves around the central carbon atom.
2)Lone pair - lone pair > lone pair - bond pair > bond pair - bond pair.
3)Lone pair-lone pair / lone pair-bond pair > B.P - B.P. Since lone pairs are not involved in bond formation, they are free to make more repulsion. But bond pairs are bond between two atoms and they are very close to nucleus. As a result they make lower repulsion.