Phenol reacts with aqueous bromine and decolorizes aqueous bromine forming the white precipitates of:
Correct answer: C. 2,4,6-Tribromophenol
- A. 2,4-Dibromophenol
- B. 2-Bromophenol
- C. 2,4,6-Tribromophenol
- D. 3-Bromophenol
Explanation
The -OH group of phenol is a very strong activating group for electrophilic aromatic substitution. The reaction with bromine water is rapid and goes to completion, substituting bromine atoms at all available ortho and para positions, resulting in a white precipitate of 2,4,6-tribromophenol.
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About Alcohols and Phenols
Alcohols are classified as primary, secondary or tertiary and studied through their hydrogen bonding, acidity, oxidation and reactions with active metals, acids and halogenating agents. Phenols require separate treatment because the hydroxyl group is attached to an aromatic ring, making their acidity and electrophilic substitution different from ordinary alcohols.
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