Phenols

Step 1: Concept
Phenol is highly activated toward electrophilic aromatic substitution due to the effect of the group.
Step 2: Bromine Water Effect
In aqueous solution (bromine water), the ionization of phenol to the phenoxide ion is enhanced. The phenoxide ion is even more activating than phenol.
Step 3: Reaction
Substitution occurs at all available ortho and para positions simultaneously. .
Step 4: Conclusion
The product is a white precipitate of 2, 4, 6-tribromophenol.
Final Answer: (D)