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How lasaaignas test is  possible in c6h5NHNH2HCL although it is a diazonium salt  
Asked by Karthika.m.nair01 | 17 Feb, 2019, 06:07: PM
answered-by-expert Expert Answer
The Formula written is "Phenyl Hydrazine" - Gives a negative Sodium Extract (Fusion mixture) test also called "Lassaign's test.
 
carbon and nitrogen present in the organic compound on fusion with sodium metal gives sodium cyanide (NaCN) soluble in water. This is converted in to sodium ferrocyanide by the addition of sufficient quantity of ferrous sulphate. Ferric ions generated during the process react with ferrocyanide to form prussian blue precipitate of ferric ferrocyanide.
 
Na + C + N → NaCN
 
6NaCN + FeSO4 → Na4[Fe(CN)6] + Na2SO4
 
Na4[Fe(CN)6] + Fe3+ → Fe4[Fe(CN)6]3
 

 
Since, Benzene although hacing C atom, the ring is highly stable and for formation of NaCN it does not makes available for Na, So further reaction does not occur. and hence -Ve test is given.
Answered by Sumit Chakrapani | 18 Feb, 2019, 04:04: AM

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