Iodoform test can be used to distinguish between_________________?
Correct answer: D. all of the above
- A. ethanol and methanol
- B. acetaldehyde and methanal
- C. acetone and diethyl ketone
- D. all of the above
Explanation
The iodoform test is positive for ethanol and compounds containing the CH3CO- or CH3CH(OH)- group, including acetaldehyde and acetone. Methanol, methanal and diethyl ketone do not give the test, so each listed pair can be distinguished. A student may choose only one pair by forgetting that the same structural requirement applies to all three comparisons.
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About Reactivity of Aldehydes and Ketones
The polar carbonyl group makes aldehydes and ketones undergo nucleophilic addition, reduction and condensation reactions. Aldehydes are generally more reactive and oxidise readily to carboxylic acids, whereas ketones resist mild oxidation; reactions with hydrogen cyanide, sodium bisulfite and 2,4-DNP help identify their behaviour.
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