Dimethyl ketones are usually characterized through_____________?
Correct answer: B. Iodoform test
- A. Tollen's reagent
- B. Iodoform test
- C. Schiff's test
- D. Benedict's reagent
Explanation
A dimethyl ketone is acetone, CH3COCH3, which contains the CH3CO- group required for the iodoform test. Reaction with iodine and alkali produces yellow iodoform, CHI3. Students may choose Tollens' reagent because it is another carbonyl test, but acetone is a ketone and normally does not give the silver-mirror test.
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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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