Which one of the following does not give iodoform test?
Correct answer: D. 3-Pentanon
- A. Butanone
- B. 2-Pentanone
- C. 2-Hexanone
- D. 3-Pentanon
Explanation
Option D is correct.Only 3-pentanone does not give the iodoform test. The iodoform test is a chemical test used to detect the presence of methyl ketones. Methyl ketones are ketones that have a methyl group (CH3) attached to the carbonyl group. The iodoform test works by oxidizing the methyl ketone with iodine and sodium hydroxide to form iodoform (CHI3). Iodoform is a yellow precipitate that is easily visible. The following reactions take place in the iodoform test: R-COCH3 + 3I2 + 4NaOH → CHI3 + 3NaI + 3H2O Here, R-COCH3 represents the methyl ketone.
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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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