Question

Choose the common features of VBT and MOT: A. Resonance, B. Energy of overlapping orbitals of bonding atoms should be comparable, C. Paramagnetic behaviour of $O_{2}$, D. Symmetry of orbitals of bonding atoms.}

• A. A and B only
• B. B and D only
• C. A and C only
• D. B and C only

Hint:

Overlap is the "marriage" of orbitals; it only works with compatible energy and symmetry!

Answer 1

The Correct Option is B

Step 1: Concept Valence Bond Theory (VBT) and Molecular Orbital Theory (MOT) are models of chemical bonding.

Step 2: Meaning Both theories require effective overlap of atomic orbitals to form bonds.

Step 3: Analysis Requirement B (comparable energy) and D (proper symmetry) are essential for overlap in both theories. Resonance (A) is a VBT specific concept used to explain electron delocalization. The paramagnetic nature of $O_{2}$ (C) is a classic success of MOT that VBT fails to explain.

Step 4: Conclusion Common features are energy and symmetry requirements for orbital overlap. Final Answer: (B)