An aqueous or alcoholic solution of phenol gives an intense violet/blue/green coloration when treate — Aromatic Hydrocarbons Chemistry Question
Question
An aqueous or alcoholic solution of phenol gives an intense violet/blue/green coloration when treated with which of the following reagents, indicating keto-enol tautomerism?
Answer: B
💡 Solution & Explanation
Phenols exist almost entirely in the enol form. They form highly colored iron coordination complexes when treated with neutral $FeCl_3$ solution, a classic test to distinguish phenols from aliphatic alcohols.
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