This theory could not explain the perfect geometries of molecule such as Ammonia, Methane, Water etc. This theory did not given perfect bond angle of the molecules like water, CO2, Ammonia etc. Magnetic properties of molecule is not explained in this theory.
What are the limitations of mot?
Molecular Orbital Theory (MOT): The VBT has two most serious limitations that electrons in molecules are treated as though they are localised and behave almost as they did in isolated atoms. This means that the VBT retains the individuality of the atoms composing molecule.
What are the salient features of valence bond theory and its limitations?
(1) Coordination compounds consist of complex ions, in which ligand coordinates with the metal. (2) The ligand coordinates by donating a pair of electrons to the metal. (3) An adequate number of empty orbitals are made available by the metal atom or ion for the formation of coordinate bonds with suitable ligands.
Which Cannot be explained by VBT theory?
The valence bond theory fails to explain the tetravalency of carbon and also fails to provide insight into the energies corresponding to the electrons. The theory also assumes that the electrons are localized in certain areas.
What are the rules of valence bond theory?
Valence Bond theory describes covalent bond formation as well as the electronic structure of molecules. The theory assumes that electrons occupy atomic orbitals of individual atoms within a molecule, and that the electrons of one atom are attracted to the nucleus of another atom.
What is the postulates of valence bond theory?
The overlapping of two half-filled valence orbitals of two dissimilar atoms effects in the development of the covalent bond. This gives the property of stability to the atom. In case the atomic orbitals own more than one unpaired electron, more than one bond can be made.
What are the shortcomings of molecular orbital theory?
(d) One of the shortcomings of molecular orbital theory is its inability to account for a triple bond in the nitrogen molecule, N2. (e) One of the shortcomings of valence bond theory is its inability to account for the paramagnetism of the oxygen molecule, O2. 9. (a) constructive interaction of atomic orbitals.
What are the advantages of molecular orbital theory over valence bond theory?
Molecular Orbital Theory has several advantages and differences over VESPR & VB theory: MO does a good job of predicting electronic spectra and paramagnetism, when VSEPR and the VB theories don’t. MO theory treats molecular bonds as a sharing of electrons between nuclei.
What are the postulates of valence bond theory?
Which of the following Cannot be explained by VBT overlapping bond formation paramagnetic nature of oxygen shapes of molecules?
5. The Valence Bond Theory does not explain the paramagnetic nature of oxygen molecule. Explanation: Oxygen molecule is paramagnetic in nature, although it does not contain unpaired electrons which is not explained in VBT.
What are the salient features of VBT?
Salient features of VBT are: (i)A central metal ion provide number of vacant s,p & d orbital to ligands to form coordinate bond. (ii) Number of vacant orbitals provided by central metal ion will equal to its coordination number.
