Which bond deviates maximum from expected bond length:
Correct answer: C. Si - F
- A. C - C
- B. Si - H
- C. Si - F
- D. C - CI
Explanation
With an increase in electronegativity diference between the bonded atoms, the bond becomes shortened. For example, Si-F bond length in SiF4 is found to be 154-159 pm, whereas the addition of their covalent radii (Si=117 pm and F=64 pm) give Si-F bond length to be equal to 181 pm .
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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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