JEE MAIN - Chemistry (2004 - No. 21)
The compound formed in the positive test for nitrogen with the Lassaigne solution of an
organic compound is
Fe4[Fe(CN)6]3
Na4[Fe(CN)5NOS]
Fe(CN)3
Na3[Fe(CN)6]
Explanation
If nitrogen is present in organic compound, then sodium extract contains NaCN.
Na + C + N $$\buildrel {Fuse} \over \longrightarrow $$ NaCN
FeSO4 + 6NaCN $$ \to $$ Na4[Fe(CN)6] + Na2SO4
Na4[Fe(CN)6] changes to prussian blue Fe4[Fe(CN)6]3 on reaction with FeCl3.
FeCl3 + Na4[Fe(CN)6] $$ \to $$ Fe4[Fe(CN)6]3 + 12NaCl
Na + C + N $$\buildrel {Fuse} \over \longrightarrow $$ NaCN
FeSO4 + 6NaCN $$ \to $$ Na4[Fe(CN)6] + Na2SO4
Na4[Fe(CN)6] changes to prussian blue Fe4[Fe(CN)6]3 on reaction with FeCl3.
FeCl3 + Na4[Fe(CN)6] $$ \to $$ Fe4[Fe(CN)6]3 + 12NaCl
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