The reaction of phenol with neutral iron three chloride solution gives
Correct answer: A. a violet coloured complex
- A. a violet coloured complex
- B. a white precipitate
- C. carbon dioxide gas
- D. no visible change
Explanation
Phenols form a coloured complex with iron three ions, usually violet, and this is a quick confirmatory test for the phenolic hydroxyl group. Alcohols give no colour at all. The colour varies with the particular phenol, which is why the general term coloured complex is safer than naming one shade.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Phenols
Phenols contain a hydroxyl group directly bonded to an aromatic ring, making them more acidic than alcohols because the phenoxide ion is resonance-stabilised. Reactions include ionisation with bases, electrophilic substitution, bromination, nitration and oxidation, with attention to the difference between phenols and aliphatic alcohols.
Practise Alcohols and Phenols
535 free Alcohols and Phenols MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Phenols questions
Phenol reacts with bromine water at room temperature to give an immediate white precipitate of
Phenol reacts with sodium hydroxide solution but not with sodium carbonate solution, which shows that phenol is
Phenol is more acidic than ethanol because
Phenol is obtained industrially in large quantity by the
Which reagent distinguishes ethanol from phenol?
Warming a phenol with a carboxylic acid gives an ester only with difficulty, whereas an alcohol reacts readily. This is because