Solution :o-nitro PHENOL the intramolecular hydrogen bonding, while p-nitrophenol has intermolecular hydrogen bonding (comparatively STRONGER). Due to this reason, the boiling point of o-nitrophenol is found QUITE less than that of p-nitrophenol.Hence, o-nitrophenol is steam volatile and can be separated from p-nitrophenol by steam distillation.