A compound which does not give a positive test in Lassaigneandrsquo;s test for nitrogen isa)Ureab)Hydrazinec)Azobenzened)Phenyl hydrazineCorrect answer is option 'C'. Can you explain this answer?

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A compound which does not give a positive test in Lassaigne’s test for nitrogen is

a)
Urea
b)
Hydrazine
c)
Azobenzene
d)
Phenyl hydrazine

Correct answer is option 'C'. Can you explain this answer?

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Most Upvoted Answer

A compound which does not give a positive test in Lassaigne’s te...

Lassaigne’s test for nitrogen detects nitrogen in organic compounds by forming sodium cyanide (NaCN) upon fusion with sodium. For this to happen, the compound must contain carbon and nitrogen in its structure, as the carbon is necessary to form the cyanide ion.

Urea (NH₂CONH₂): Contains carbon and nitrogen, gives a positive test.
Hydrazine (N₂H₄): Although it lacks carbon, hydrazine can form NaCN in the presence of a carbon source (e.g., sodium carbonate) during fusion, so it gives a positive test.
Azobenzene (C₆H₅N=NC₆H₅): Contains a nitrogen-nitrogen double bond, which is stable and does not form NaCN during fusion, so it does not give a positive test.
Phenyl hydrazine (C₆H₅NHNH₂): Contains carbon and nitrogen, gives a positive test.

Thus, azobenzene is the correct answer.

Answered by Sushil Kumar · View profile

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