In this example, electronegativity arguments were productive. However, these arguments would be problematic for molecules such as phenol or anisole. For OC1, electronegativity accounts for properties related to acid-base chemistry, bond energies, and reactivity. Therefore, it is unsurprising that electronegativity is activated to a greater extent for OC1 students. While OC2 uses resonance more extensively, electronegativity is used to 365 explain trends in electrophilic aromatic substitution for molecules that have -CF3 or halogen substituents.