Which of the following reacts with aqueous alkaline iodine:
Correct answer: B. Ethanol
- A. 1-Propanol
- B. Ethanol
- C. Methanol
- D. 2-Methyl-2-propanol
Explanation
The iodoform test is a chemical test used to detect the presence of a methyl ketone or a secondary alcohol in a given substance. It involves the reaction of the compound with iodine (I2) and sodium hydroxide (NaOH) to produce a yellow precipitate of iodoform (CHI3). Ethanol is the only primary alcohol to give iodoform test.
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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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