Questions
Which one of the following order is correct for the bond dissociation enthalpy of halogen molecules?
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a
Br2>I2>F2>Cl2
b
F2>CI2>Br2>I2
c
I2>Br2>Cl2>F2
d
CI2>Br2>F2>I2
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Correct option is D
Enthalpy of dissociation decreases as the bond distance increases from F2 to I2 due to increase in size of the atom as we move down the group. Due to electron-electron repulsions between the lone pairs in small sized F atoms, the bond dissociation enthalpy of F2 is, however, smaller than that of Cl2 and even smaller than that of Br2Thus, the order of bond dissociation enthalpy is Cl2>Br2>F2>I2
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