Which of the following tests is used for distinguishing methyl ketones from other ketones?
Correct answer: C. Iodoform test
- A. Silver mirror test
- B. Silver nitrate test
- C. Iodoform test
- D. Lucas test
Explanation
The iodoform test, iodine with sodium hydroxide, gives a yellow precipitate of CHI3 only with compounds containing the CH3CO group, so it separates methyl ketones from other ketones. The silver mirror test separates aldehydes from ketones, and the Lucas test classifies alcohols.
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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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