Phenols are characterized a) their behavior as gases b) ether linkages c) an —oh group on a benzene ring d) their use of flavoring agents

Option A is incorrect because phenol exists in liquid state at room temperature and its boiling point is 181 °C.

Option B is incorrect because there is no ether linkage in phenol. Its chemical formula is Ph-OH.

Option C is correct. As the chemical formula cited above contains hydroxyl group (i.e. -OH).

Option D can be considered incorrect because only one derivative of phenol (Guaiacol)is used as flavoring agent in whisky.