Which of the following presents the correct decreasing order for the bond dissociation enthalpies of — Chemical Bonding Chemistry Question
Question
Which of the following presents the correct decreasing order for the bond dissociation enthalpies of halogen molecules?
Answer: C
💡 Solution & Explanation
The expected trend based on size is $F_2 > Cl_2 > Br_2 > I_2$. However, due to the extremely small size of F, intense lone pair-lone pair repulsions severely weaken the $F-F$ bond, placing it below chlorine and bromine.
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