Which molecule has the highest bond energy among the halogens_________________?
Correct answer: B. Chlorine
- A. Fluorine
- B. Chlorine
- C. Iodine
- D. Bromine
Explanation
The F-F bond is unusually weak because the small fluorine atoms bring their lone pairs into strong repulsion, while the larger halogens have less such repulsion. Among F2, Cl2, Br2 and I2, Cl2 consequently has the highest bond dissociation energy. Fluorine is the likely wrong choice because it is the most electronegative and reactive halogen, but reactivity is not the same as bond energy.
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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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