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NEETChemistryp Block Elements (Group 15, 16, 17 & 18)

Why does F 2 have a smaller enthalpy of dissociation compared to Cl 2 ?

Options

  1. ASmaller atomic size of fluorine
  2. BGreater electron-electron repulsion in F 2
  3. CHigher ionization enthalpy of fluorine
  4. DWeaker fluorine-fluorine bond

Correct answer

B. Greater electron-electron repulsion in F 2

Step-by-step solution

F 2 has a smaller enthalpy of dissociation compared to Cl 2 due to the relatively large electron-electron repulsion among the lone pairs in the F 2 molecule, where they are much closer to each other than in the case of Cl 2 .**

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