Why do phenols give deep coloration with neutral ferric chloride?

On reacting with neutral ferric chloride, phenol gives

Bonding in ferric chloride is

A compound containing acetate radical is made to react with neutral ferric chloride. The solution is then diluted with water and boiled for 1-2 minutes. A reddish brown precipitate is obtained.Give the chemical composition of reddish brown precipitate.

Compound 'A' turns the blue litmus paper red and gives voilet colour when treated with aqueous neutral ferric chloride solution. It reacts with chloroform in the presence of aqueous NaOH to give salicylaldehyde. Idetify the compound 'A' and name the reaction.

Which of the following compounds will give a characteristic deep colour with ferric chloride solution ?

Prepare carbolic acid from benzene sulphonic acid. Write a chemical equation for the action of neutral ferric chloride on phenol.

An organic compound neither reacts with neutral ferric chloride solution nor with Fehling solution. It however, reacts with Grignard reagent and gives positive iodoform test. The compound is

Phenol give violet colour with aqueous neutral solution of ferric chloride due to the presence of