Appropriate level of theory for bond dissociation reaction

2018-03-17 10:25:17

When considering bond dissociation reactions eg. MX6 -> MX5 + X

HF would not be an appropriate level of theory due to it's harmonic nature being unable to account for bond breaking/formation. Keeping the type of reaction in mind would any level of theory among PM6, CCSD(T) and B3LYP be appropriate?