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Infrared spectroscopy is a technique utilized to separate cyclohexanone from a mixture containing benzoic acid, isoamyl alcohol, cyclohexane, and cyclohexanone. This is because specific functional groups exhibit characteristic absorption peaks. Which statement correctly identifies cyclohexanone?

1. Amyl alcohol refers to any one of eight alcohols with the molecular formula C5H12O, which are alkanols containing five carbon atoms.
2. Hydrazine (NH2NH2) lacks carbon atoms and therefore cannot produce NaCN when fused with sodium metal.
3. It does not give a positive result in Lassaigne’s test for nitrogen.
4. Cyclohexanone can be recognized by its distinctive carbonyl absorption peak.

Correct answer: Cyclohexanone can be recognized by its distinctive carbonyl absorption peak.

Solution

The question specifically mentions the identification of cyclohexanone using IR spectroscopy, which is based on the carbonyl peak. This makes option D the correct answer.

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