Question

Name the molecule whose structure are not explained by VBT?

Answer 1

Explanation for Correct answer:

• Postulates of Valence Bond Theory(VBT):
• A covalent bond is formed by overlapping orbitals having two unpaired electrons of opposite spins.
• The strength of the covalent bond formed depends on how much the overlapping is.
• The energy of the molecule decreases or in other words, the molecule becomes more stable due to the formation of a covalent bond.
• The extent of overlapping of orbitals follows the following order:
  s-s overlapping > s-p overlapping > p-p overlapping
• Overlapping along the axis is stronger than overlapping sideways.

Therefore, Methane(${\mathrm{CH}}_4$) is a molecule whose structure are not explained by Valence Bond Theory(VBT).