In an octahedral structure, the pair of d orbitals involved in d2sp3-hybridisation is:
1.
2.
3.
4.
Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?
1. Cl2 > Br2 > F2 > I2
2. Br2 > I2 > F2 > Cl2
3. F2 > Cl2 > Br2 > I2
4. I2 > Br2 > Cl2 > F2