Final answer:
A phenoxyl radical is represented by removing one hydrogen from the hydroxyl group of phenol, leaving an unpaired electron on the oxygen atom.
Step-by-step explanation:
The student has asked how to represent a phenoxyl radical which is a type of chemical species derived from a phenolic compound. A phenoxyl radical is formed when a phenol molecule loses a hydrogen atom from its hydroxyl group, leaving an unpaired electron on the oxygen atom, creating a radical species.
To draw the phenoxyl radical from compound 3, which would presumably be a phenol derivative, you need to start with the basic structure of phenol - a hydroxybenzene ring - and then remove one hydrogen from the hydroxyl group to create the radical. Just imagine a benzene ring with an OH group where one of the hydrogens from the OH has been removed, which leaves an unpaired electron represented by a dot next to the oxygen atom.