Least bond energy is associated with:
Correct answer: C. O - O
- A. C - C
- B. N - N
- C. O - O
- D. S - S
Explanation
The correct answer is Option C: O - O. The bond energy of an O-O bond is 146 kJ/mol, which is the lowest among the options presented. This is due to the lone pair-lone pair repulsion in oxygen molecules, which reduces the overall bond strength. The C-C bond has a higher bond energy of 348 kJ/mol due to effective overlap of carbon's p orbitals. The N-N bond has a bond energy of 163 kJ/mol, stronger than O-O because of less repulsion between lone pairs. The S-S bond has a bond energy of 266 kJ/mol, which is higher than the O-O bond as well, largely due to differences in atomic size and bond structure.
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Chemical bonding explains molecular shape through VSEPR theory and distinguishes sigma bonds from pi bonds. Questions involve hybridization, bond angles, dipole moment and bond energy, including how electron-pair repulsion determines geometry and how bond polarity differs from the overall polarity of a molecule.
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