Question

Pipette 1 drop of aqueous solution of phenol into a test tube and add 3 drops of 2 N

NH4OH, then add 3 drops of saturated of bromine water. In a few seconds you will

observe blue color indicating to the formation of indophenol. Describe your

observation and write all reaction equations.

Answer 1

Reddish brown ppt. of ferric hydroxide is formed which is insoluble in ammonium hydroxide.
6NH$_4$ ​OH+2FeCl$_3$ →2Fe(OH)$_3$ +6NH$_4$ Cl