The strength of a covalent bond generally increases as
Correct answer: B. the bond length decreases and the bond order rises
- A. the bond length increases
- B. the bond length decreases and the bond order rises
- C. the atoms become larger
- D. the electronegativity difference falls to zero
Explanation
Shorter bonds hold the nuclei closer to the shared electrons, so more energy is needed to separate them, and each extra shared pair shortens the bond further. This is why the carbon to carbon triple bond is both the shortest and the strongest of the three. Larger atoms form longer and therefore weaker bonds, which is why bond strength falls down a group.
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About Bond Energy
Bond energy is the energy needed to break one mole of a particular covalent bond in gaseous molecules, while bond formation releases energy. Reaction enthalpy is estimated by subtracting the total energy of bonds formed from bonds broken, with attention to average bond energies and their limitations for specific molecules.
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