The theories which explain the formation of sigma and pi bond are EXCEPT:
Correct answer: D. CFT
- A. MOT
- B. VBT
- C. VSEPR
- D. CFT
Explanation
Crystal field theory deals with how the d orbitals of a transition metal ion are split by the surrounding ligands, so it explains colour and magnetic behaviour in complexes rather than the formation of sigma and pi bonds. Valence bond theory and molecular orbital theory both describe those bonds directly through orbital overlap. VSEPR predicts shape from electron pair repulsion and so also concerns bonding.
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About Sigma and Pi Bonds
A sigma bond forms by direct end-to-end overlap along the internuclear axis, whereas a pi bond forms by sideways overlap of parallel orbitals. The topic covers single, double and triple bonds, bond composition, restricted rotation and the relation between sigma and pi bonding and orbital hybridisation.
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