Which of the following will give a positive iodoform test?
Correct answer: D. Acetone
- A. Pentan-3-one
- B. Benzaldehyde
- C. Propanal
- D. Acetone
Explanation
The iodoform test is a qualitative test for the presence of a methyl ketone group (CH₃-CO-) or an alcohol that can be oxidized to a methyl ketone. Acetone (CH₃COCH₃) is the simplest methyl ketone and gives a positive test, forming a yellow precipitate of iodoform (CHI₃).
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About Aldehydes and Ketones
Aldehydes and ketones contain the polar carbonyl group, but aldehydes are generally more readily oxidised and more reactive than ketones. Coverage includes preparation by oxidation or reduction routes, nucleophilic addition of reagents such as hydrogen cyanide and bisulfite, and tests that distinguish aldehydes from ketones.
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