Valence bond theory limitations pdf

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The valence bond theory fails to explain the various colors that the coordination compounds exhibit. This is also relatable to the Werner theory. The valence bond theory does not give a quantitative interpretation of the thermodynamic stabilities of the coordination compounds. A covalent bond in VB theory is a bond formed when the atomic orbitals of two atoms overlap and each share one electron each having opposite spins (you may recall the electron spin quantum number, Valence bond theory views bonds as weakly coupled orbitals (small overlap). Valence bond theory is typically easier to employ in ground state molecules. The core orbitals and electrons remain essentially unchanged during the formation of bonds. σ bond between two atoms: localization of electron density Two p-orbitals forming a π -bond. Limitations of Valence Bond Theory The shortcomings of the valence bond theory include Failure to explain the tetravalency exhibited by carbon. No insight is offered on the energies of the electrons. The theory assumes that electrons are localized in specific areas. Limitations of Valence bond theory: It does not give explain magnetic properties/data. It does not explain the color indicated by coordination compounds. It does not give an explanation of the thermodynamic/kinetic stabilities of coordination complexes. It does not differentiate between weak/strong ligands. Suggest Corrections 17 Similar questions Limitations of valence Bond Theory : This theory does not explain : (i) The directional nature of covalent bond. (ii) The formation of co-ordinate bond in which shared pair of electrons is contributed by only one of the combining atoms. (iii) The paramagnetic nature of O2 molecule. (iv) The structures of odd electron molecules or ions where no Valence bond theory explains a covalent bond as the intersection of half-filled atomic orbitals that produce a pair of electrons pooled between the two bonded atoms or molecules. We say that orbitals on two different molecules intersect when a quota of one orbital and a quota of a second orbital occupy the same area of space. Valence Bond theory & Hybridization. 1. Valence Bond Theory & Hybridization T- 1-855-694-8886 Email- info@iTutor.com By iTutor.com. 2. The valence bond theory was proposed by Heitler and London to explain the formation of covalent bond quantitatively using quantum mechanics. Later on, Linus Pauling improved this theory by introducing the Though the Crystal Field Theory is successful in explaining most of the cases, it fails to take into account the fact that the ligands do not attract the positive charge of the central atom with just electrostatic forces. The above explanation is known as 'Valence Bond Theory'. Limitations of Crystal Field Theory Limitations of Valence Bond Theory Failure to account for carbon's tetravalency. There is no information provided about the energies of the electrons. The theory assumes that electrons are concentrated in specific locations. It does not provide a quantitative interpretation of coordination compounds' thermodynamic or kinetic stabilities. This Perspective presents a survey