Which one of the following order is correct fo the bond energies of halogen molecules?
Which one of the following order is correct fo the bond energies of halogen molecules?
A. `I_2 gt Cl_2 gt Br_2`
B. `Br_2 gt Cl_2 gt I_2`
C. `I_2 gt Br_2 gt Cl_2`
D. `Cl_2 gt Br_2 gt I_2`
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Correct Answer - D
Order of atomic radii: Cl lt Br lt I
Order of X-X bond length: `Cl_2 lt Br_2 lt I_2`
Shorter the bond, stronger the bond, more is the bond energy. Therefore, B.E. are in the order `Cl_2 gt Br_ 2 gt I_2`
However, the trend for `F_2`, is not what is expected from bond length data.
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