The basic principle of both theories is same that is distribution of electrons but mot is superior to vbt. The reason is that vbt could not explain paramagnetic character of oxygen while the mot has sucessfully explain the paramagnetic character of oxygen.
Why MOT is superior over VBT?
MOT describes the mixing of orbitals when creating a molecule and also presents an idea to aim group and symmetry of the molecule. But VBT only localized two atoms, not molecules . So, MOT is superior to VBT.
Why is molecular orbital theory is preferred over valence bond theory?
MO theory actually predicts electron transitions because of the differences in the energy levels of orbitals in the molecule . MO theory has been more correct in numerous instances and for this reason it is preferred. Valence Bond theory describes covalent bond formation as well as the electronic structure of molecules.
What is the main difference between VBT MOT?
| Valence Bond Theory (VBT) Molecular Orbital Theory (MOT) | Bonds are localized to two atoms not molecule. Bonds are localized to two atoms as well as molecule. |
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Why MOT is a successful theory of bonding?
Molecular orbital theory revolutionized the study of chemical bonding by approximating the states of bonded electrons —the molecular orbitals—as linear combinations of atomic orbitals (LCAO).
What are limitations of VBT?
Limitations of Valence Bond Theory
They are: It fails to explain the tetravalency of carbon. This theory does not discuss the electrons' energies . The assumptions are about the electrons being localized to specific locations.
What is the limitation 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.
Who proposed VBT?
In the valence bond (VB) theory, proposed in large part by the American scientists Linus Pauling and John C. Slater , bonding is accounted for in terms of hybridized orbitals of the... The basis of VB theory is the Lewis concept of the electron-pair bond.
Which is more stable sigma or pi bond?
Pi Bonds “π”
A pi bond is a weaker chemical covalent bond than a sigma bond (since π bonds have a smaller overlap between the orbitals), but when it is put with a sigma bond it creates a much stronger hold between the atoms, thus double and triple bonds are stronger then single bonds.
What are the main points of similarity and difference between VBT and mot?
In vbt atomic bonds which develop are monocentric and mot develops molecular bond of polycentric . 2. Vbt can take form to produce the presence of ionic character whereas Mot is not capable of producing or predecting such effect.
What is the difference between VBT and Vsepr theory?
These theories are applied to compounds having covalent bonds. The difference between VSEPR and valence bond theory is that VSEPR theory explains the shape of a molecule whereas valence bond theory explains the creation of chemical bonds between atoms of a molecule.
What is the difference between VBT and CFT?
Summary – VBT vs CFT
The term VBT stands for valence bond theory. The term CFT stands for crystal field theory. The key difference between VBT and CFT is that VBT explains the mixing of orbitals whereas CFT explains the splitting of orbitals.
Who proposed MOT?
MOLECULAR ORBITAL THEORY (M.O.T) IS PROPOSED BY HUND AND MULLIKEN .
What is VBT and MOT?
Valence bond theory (VBT)
After the bond formation, the combining atoms in a molecule retain their identity. Bonding is explained with the help of atomic orbitals. Only the half-filled atomic orbitals of the valence shell take part in bond formation. The concept of resonance is applicable only to valence bond theory.
What are the postulates of VBT?
1) Valence orbitals of atom overlap each other to form a bond. 2) A pair electrons is present in overlapping orbitals. 3) Electron density is maximum around bonded atoms . 4) Degree of overlapping determines strength of the bond.
How was the VBT extended by Pauling and Slater?
Valence bond theory was proposed by Heitler and London in (1927) and it was extended by Pauling and Slater (1931). It is based on the following concepts. The pairing of electrons . ... Overlapping of orbitals containing unpaired electrons to give a region of common electron density to the combining atoms.
