1. (A) of molecular formula C6H6O gives violet colour with neutral FeCI3 means it must be Phenol – C6H5OH.
2. Phenol couples with benzene diazonium chloride in the presence of basic medium to produce p-hydroxy azo benzene, a red orange dye as (B).
3. Phenol on reaction with acidified K2 Cr2O7 undergoes oxidation reaction to give 1, 4 – benzo quinone as (C).
4. Phenol on reaction with H2 , in the presence of Nickel gives cyclohexanol as (D).