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Hydrazine (NH2NH2) lacks carbon atoms, so it cannot produce NaCN when fused with sodium metal, and thus fails to give a positive result in Lassaigne’s test for nitrogen.

1. Hydrazine (NH2NH2) lacks carbon atoms, so it cannot produce NaCN when fused with sodium metal.
2. It fails to give a positive result in Lassaigne’s test for nitrogen.
3. Cyclohexanone can be identified due to its carbonyl group absorption.
4. Amyl alcohol refers to any of the eight alcohols with the molecular formula C5H12O (a five-carbon alkanol).

Correct answer: It fails to give a positive result in Lassaigne’s test for nitrogen.

Solution

Hydrazine lacks carbon, so it cannot form NaCN during Lassaigne's test, which is why it does not show a positive result for nitrogen detection.

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