A) \[{{K}_{4}}[Fe{{(CN)}_{6}}]\]
B) \[F{{e}_{4}}{{[Fe{{(CN)}_{6}}]}_{3}}\]
C) \[N{{a}_{3}}[Fe{{(CN)}_{6}}]\]
D) \[C{{u}_{2}}[Fe{{(CN)}_{6}}]\]
E) \[N{{a}_{2}}[Fe{{(CN)}_{2}}NO]\]
Correct Answer: B
Solution :
In the Lassaignes test, a blue colour is obtained if the organic compound contains nitrogen. The blue colour is due to ferri-ferro cyanide i.e., \[F{{e}_{4}}{{[Fe{{(CN)}_{6}}]}_{3}}\]
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